Evidence of nonverbal communication between nurses and older adults: a scoping review

Background Communication is an integral part of life and of nurse-patient relationships. Effective communication with patients can improve the quality of care. However, the specific communication needs of older adults can render communication between them and nurses as less effective with negative outcomes. Methods This scoping review aims at describing the type of nonverbal communication used by nurses to communicate with older adults. It also describes the older adults’ perceptions of nurses’ nonverbal communication behaviors. It followed (Int J Soc Res 8: 19-32, 2005) framework. Grey literature and 11 databases were systematically searched for studies published in English and French, using search terms synonymous with nonverbal communication between nurses and older adults for the period 2000 to 2019. Results The search revealed limited published research addressing nonverbal communication between older adults and nurses. The studies eligible for quality assessment were found to be of high quality. Twenty-two studies were included and highlighted haptics, kinesics, proxemics, and vocalics as most frequently used by nurses when communicating with older adults; while studies showed limited use of artefacts and chronemics. There was no mention of nurses’ use of silence as a nonverbal communication strategy. Additionally, there were both older adults’ positive and negative responses to nurses’ nonverbal communication behaviors. Conclusion Nurses should be self-aware of their nonverbal communication behaviors with older adults as well as the way in which the meanings of the messages might be misinterpreted. In addition, nurses should identify their own style of nonverbal communication and understand its modification as necessary in accordance with patient’s needs.

disabilities may restrict their interaction, participation and effective communication [11].
Communication occurs through verbal or nonverbal modalities [12,13]. Nonverbal communication (NVC) is defined as a variety of communicative behaviors that do not carry linguistic content [14] and are the messages transmitted without using any words [15,16]. NVC can act as a counter measure or an adjunct to verbal messages, in that it is more reliable if there is inconsistency between verbal and nonverbal messages [17]. Therefore, it is important that there is congruence between nonverbal and verbal messages [18], with research showing that patients are particularly alert to nurses and nurse-aids nonverbal behaviors [17,[19][20][21], especially when they are anxious and feel uncertain [14]. Despite the value of communication, it has been shown that healthcare workers spent very little time communicating with patients not satisfied with the information they received and how it was communicated [22]. Though verbal communication behaviors of healthcare providers have been extensively studied, their NVC behaviors have received less attention [17].
Scholars have varied in their estimations of the proportion of NVC in communication, with estimates as high as 93% [23], with other estimates of 60 to 90% [24]. Moreover, scholars have described different modalities of NVC, including artefacts (presence of physical and environmental objects), chronemics (use and perception of time), haptics (use of touch), kinesics (form of movement of the body), physical appearance (body type and clothing), proxemics (use of space and distance), vocalics (aspects of the voice), and silences [23,[25][26][27].
Concern needs to be directed on NVC and its different modalities as critical contributors to high quality care which plays a significant role in demonstrating respect for patients, fostering empathy and trusting providerpatient relationships [24]. A significant relationship exists between patient's perceptions of empathy and eye contact and social touch [28], with touch, and gestures described as communication facilitators [27]. Nurses' positive facial expressions demonstrate signs of bonding, respect and affection towards older patients [29] while voice tones have contributed decisively to the success of interactions with older adults [30]. On the other hand, limited time has been reported by patients to have a negative impact on communication [31,32], demonstrated in gestures of irritability which have caused embarrassment in older patients [29], and speaking fast has been a further communication barrier between nurses and patients [32]. The present review suggests the importance of understanding NVC between nurses and older adults, and underscores the need for focused research to address the gap in the knowledge of communication in geriatric care. The primary aim of the study was to identify the type of NVC strategies used by nurses to communicate with older adults in both acute care settings and long-term care settings.

Methods
In order to map evidence-based knowledge and gaps [33][34][35] related to NVC between nurses and older adults, a systematic scoping review was conducted. Scoping reviews are useful to map the existing literature around a particular topic by charting findings and identifying research gaps [36], especially when the topic is complex or poorly reviewed [37]. A scoping review was chosen over a systematic review because the purpose of the study was to identify knowledge gaps related to nonverbal communication, as opposed to confirming or refuting the basis of current practice against relevant evidence [38]. The study adopted the framework proposed by Arksey and O'Malley [36] and further refined by Levac et al. [39]. The Preferred Reporting Items for Systematic reviews and Meta-Analyses extension for Scoping Reviews (PRISMA-ScR) Checklist [34] was followed for this review (Additional file 1).

Research questions
The main question for this review was: What is the evidence of NVC between nurses and older adults? The sub questions were: (i) What are the different modalities of NVC used in geriatric nursing care? (ii) What are the functions of using the different NVC modalities? (iii) How do older persons respond to different NVC modalities?

Eligibility criteria
The JBI framework of Population, Concept, Context (PCC) was used to determine the eligibility of the research question for this review (Table 1).

Population
Nurses including nursing students were considered in addition to qualified nurses and nurse aides because they are the largest population of healthcare workers [40].

Concept
The focus was NVC between nurses and older adults (≥60 years). For the purpose of this review, the United Nations cut-off of 60 years and older referring to the older adult population in Africa [41] was considered; yet, most Upper Income Countries have accepted the chronological age of 65 years and older, the age of retirement, as a definition of an older adult [42]. Socioeconomic and disease reasons suggest that 65 years is not readily applicable to the African context [43].
Older adults with dementia were excluded although they are able to send and receive nonverbal information [39]. Dementia care combines comorbidities, cognitive and functional decline; leading to complex needs and ever-increasing difficulty for the patient in articulation [44], which is viewed as a challenging form of care.

Context
Acute settings and nursing homes were included into the context. In nursing homes, care is usually carried out by nursing staff with different levels of education and training [45]. Furthermore, community settings were excluded from the context because hospitalization is potentially stressful and involves unpleasant experiences for patients and their families [1], and thus offers a greater opportunity to identify the phenomenon under discussion.

Search strategy
The search terms for this review originated from indexed subject headings, keywords of relevant studies, that recurred repetitively, and the Medical Subject Headings (MeSH) terms. The term 'nonverbal communication' was used as a starting point to develop a search string and identified other keywords to refer to NVC. The string/Boolean search terms for this review included: Participants ("nurses" OR "registered nurse" OR "professional nurses" OR "students nurses" OR "nurse aides") AND Concept ("nonverbal communication" OR "kinesics" OR "proxemics" OR "artefacts" OR "chronemics" OR "haptics" OR "vocalics" OR "physical appearance" OR "active listening" OR "silences") AND Context ("old people" OR "elder" OR "elderly" OR "older people" OR "aged" OR "geriatrics").

Database searching
A range of sources were used to ensure a comprehensive coverage of the literature. An initial search was conducted in August 2017, repeated and finalized in November 2019 The search made use of the following databases: Pubmed, Science Direct, Sabinet, Academic search complete, CINAHL with Full Text, Education Source, Health Source-Consumer Edition, Health Source: Nursing/Academic Edition, and MEDLINE.
Google Scholar and Open Grey engines were also used to source relevant literature. Additionally, the reference lists of the included studies were used to search for additional studies. Only studies written in either English or French were retrieved.
Evidence of nurses' NVC strategies while communicating with older adults, conducted in acute settings, and published in English or in French between 2000 and 2019 were included. Quantitative, qualitative, mixedmethods primary research studies, and reviews published in peer-reviewed journals, and grey literature that addressed the research question such as book chapters, thesis and reports were included. Evidence on communication with older adults suffering from communication impairment or dementia, in psychiatric units or communities, published in languages other than English or French were excluded. Evidence published before 2000 were excluded.

Study selection
The titles were reviewed against the eligibility criteria by EW. This initial search was monitored, exported into EndNote X9 reference manager, for abstract and full text screening by EW. The duplicated studies were deleted, followed by independent reviewing of the abstracts by EW and JK. Studies deemed 'unclear' were advanced to the subsequent screening stage. Assistance from the study university library services was requested when full texts could not be retrieved from the databases and five full texts were provided. Full text of 75 eligible studies were independently filtered by EW and JK using Google forms. Additionally, a search of the reference list of all identified reports and studies for additional studies was performed by EW. MAJ pronounced on the discrepancies that occurred during the abstract screening and the full text screening until a consensus was reached.

Data extraction
Information relevant to the aim of this study were extracted independently by EW and JK. A data extraction form was developed electronically using Google forms. Extracted data included bibliographic details, country and setting, aim/objective, study design, targeted population, nurses' nonverbal strategies used while communicating with older adults, older adults' interpretation of nurses' nonverbal behaviors, and relevant outcomes of interest. Discussions between EK and JK refined the table of information extracted.

Quality appraisal
The Mixed Methods Appraisal Tool (MMAT), version 2018 [46] was independently used by EW and JK to critically appraise the quality of the included primary studies. Discussion was used to resolve discrepancies. The MMAT allowed for assessment of the appropriateness of the aim of the study, adequacy and methodology, study design, participant recruitment, data collection, data analysis, and the presented findings [46]. The quality of studies was graded with a quality score ranging from ≤ 50% as low quality, 51-75% considered as an average quality, and 76-100% considered as high quality (Table 3).

Collating and summarizing the data
Content thematic analysis approach [64] was employed to extract relevant data that answered the study questions. The results of the included studies were summarized, manually coded, and presented using a narrative approach. The nurses' NVC behaviors were categorized under nine items namely (i) artefacts; (ii) chronemics; (iii) haptics; (iv) kinesics; (v) proxemics; (vi) vocalics; (vii) physical appearance; (viii) active listening; and (ix) silence.

Results
Two hundred and fifty-seven (257) studies met the eligibility criteria following the deletion of 478 duplicates from the 735 studies identified at the title screening stage (Fig. 1). Characteristics of included studies Tables 2 and 3 summarize the characteristics of the 22 included studies. All included studies were published in English and no eligible French studies were identified.

Quality of evidence
Of the 22 included studies, 16 studies underwent methodological quality assessment using the MMAT version 2018 [46]. The remaining six [3,4,50,56,61,63] were excluded from the quality appraisal because they were

Study results
Three outcomes were reported in the studies: the NVC behaviors of nurses, the functions of those behaviors and the responses of older adults to the NVC behaviors.

Nurses' NVC behaviors and their functions
Of the 22 included studies, 20 reported on nurses' NVC behaviors including haptics, kinesics, proxemics, vocalics, active listening, artefacts, and chronemics. There was no mention of physical appearance nor silences in all the included studies.

Haptics
Haptics were reported in 17 studies [3, 4, 19, 30, 48-54, 57, 60-63, 65] of which 12 studies, which underwent quality appraisal, were of high quality. Haptics were identified when nurses shook hands with older adults, held their hands, stroked or touched their hands. Nurses also kissed older adults, hugged them or gave them a pat on the shoulder. In a study aiming at examining the special nature of communication between residents and staff in a Japanese elderly care institution, haptics were referred to as a handshake given by a member of staff against one older adults will [52]. This type of touch was used in a joking manner in Japan, where handshakes are uncommon, but was imposed on the older adult who did not appreciate it [52]. In another study conducted on types and examples of nurse aides-initiated communication with longterm care residents during mealtime assistance, haptics referred to a handshake when staff praised the older adults for eating all their food or to a touch on the arm for raising attention [57]. Stroking older adults' hands were reported to be a means of conveying attention or affection while holding one older adult's head back was used by a nurse to appease a negative response from the Author's reflection on her encounter with an old person Nurses' nonverbal communication strategies: holding of hand, sitting next to proxemics, haptics older adult in a study exploring the nature of communication between care staff and residents who did not share the same languages and ethno-cultural backgrounds [48]. Hugs were mentioned as a deliberate communication strategy used by a nurse practitioner to meet the unique needs of older adults in a study aimed at describing communication between nurse practitioners and older adults [65]. Hugs were also reported by nurses as a conscious NVC strategy specific to each older adult to establish rapport and prevent communication breakdowns between nurses and older adults [48]. An example was demonstrated through staff rubbing the sleepy older adult under the chin as a form of stimulus [48]. Additionally, a pat on the shoulder was mentioned as a caring gesture in a study aimed at characterizing the meaning of and experiences with individualized care from the perspectives of both nursing aides and nursing home residents [51]. However, a kiss on an older adult male's forehead was described as inappropriate conduct [52].

Kinesics
Kinesics was reported in 14 studies [19, 30, 48-50, 53, 54, 56, 57, 59-61] of which 8 studies, which underwent quality appraisal, were of high quality. Nursing students developing personal competence in international clinical practice, used pointing and thumbs up, as movements of the hands, to communicate nonverbally when words were in short supply [54]. Further, a Swedish study described nurses' use of pointing to communicate with older adults and their relatives in a department of medicine for older adults [47].
Kinesics also referred to as movements of the head, included facial expressions, movements of the eyes, and head nods. Student nurses' use of facial expressions and eye contact were described as components of effective communication with older adults [60]. While facial expressions such as a smile and laugher were reported to both quickly and amicably resolve disagreements between staff and older adults, smiles were seen as enhancers of the communication in a study where staff occasionally engaged in smiling with older adults [48]. A nurses' smile was also seen as a way to either convey the message [54], to initiate communication [57] or an attempt to create a positive atmosphere during the meeting with older adults [47].
Student nurses described head nodding as a means to convey their message nonverbally when communicating with older adults [54]. Nodding was also used to convey communicative intent nonverbally, to indicate acceptance or rejection of staff's actions [48], and to address or to praise the older adult [57]. Additionally, nodding was used by nurses to show that they had understood what older adults and their relatives had said [47].
Eye gaze was seen as nurses' willingness to be engaged in conversation in a review on evidence-based strategies for effective communication with older adults across long-term care settings [50]. Eye gaze was also used to gain older adults' attention, or as means to both connect relationally and instrumentally [48]. Additionally, eye gazing was used to gain older adults' attention, when the nature of communication between care staff and residents using different languages and having ethnocultural backgrounds was explored [48]. Eye contact was suggested as advice to effectively communicate with older adults [3], or a means of improving communication skills [61]. However, Visual Code factor was among the factors that received the lowest scores in a study analyzing the performance of nurses in nursing consultation for the older adults based on the theoretical framework of Hall [49]. The low score was justified by the unpreparedness of nurses about the aging process [49].
Movements of the body included leaning over older adults to assess their progress [61] or to check on them in a study conducted on types and examples of nurse aide-initiated communication with long-term care residents during mealtime assistance [57]. Additionally, leaning forward was a means to indicate the nurses' eagerness and readiness to listen to the older adults' stories, in a study providing pointers to help clinicians listen to the needs and concerns of older adults [56].

Proxemics
Proxemics, defined as the social meaning of space and interactive field, which determines how relationships occur [115] were reported in 10 studies [3,4,30,47,49,56,59,61,63], and included physical proximity and physical distance. Of these studies, eight were of high quality based on the MMAT assessment.
Speaking far away was mentioned as a nurse-related communication barrier perceived by both older adults and nurses [59]. Additionally, a Swedish study noted that nurses remained standing while using a medical voice to communicate with older adults, [47]. In contrast, nurses positioning themselves at the same level as older adults was a strategy to support their communication with older adults [4]. Sitting next to older adults was part of the playful gestures nurses engaged in, in a study which explored the nature of communication between care staff and residents with different languages and ethnocultural backgrounds [48]. Likewise, pointers to help clinicians listen to the needs and concerns of older persons included physical presence to enhance the ability to listen and show interest [46], sitting by the older adult's side to hold their hand [63], sitting face to face to indicate presence and the readiness to listen [56]. On the contrary to the literature supporting engagement on the same plane, kneeling down was also used by nurses to make eye contact with older adults and seen in the instance of planning a good home return [47].

Vocalics
Vocalics were reported in nine studies [30,47,49,52,54,55,57,59,60] where they described different aspects of the voice tone and sense of calm. All the eight studies that underwent quality appraisal were of high quality.
A military tone with endearment used to address an older adult, in a Japanese elderly care institution, was not appreciated even though used in jest [52]. Conversely, although to no avail, a soft tone was used by a nurse to encourage an older adult to eat her food [57]. Additionally, speaking too quickly and in a demeaning tone were reported as barriers to effective communication [3]. Likewise, speaking too loudly and speaking too fast were nurserelated communication barriers as perceived by nurses and older adults [59]. Speaking faster and with a monotonous tone were reported when nurses used a medical voice to communicate with older adults as well as speaking louder and with great emphasis on selected words were reported when nurses used a power voice [47].
Conversely, speaking calmly contributed to create mutual trust in the student nurse-older adult relationships in a study demonstrating that communication and empathy can be developed by student nurses through clinical practice [54]. Speaking slower was a means for student nurses to be understood by older adults [60], and speaking with a friendly tone was used by nurses to increase the knowledge of older adults [47]. Additionally, the tone used by nurses favored communication with older adults and made possible the understanding of what was being expressed in a study aimed at assessing proxemics communication between nurse and elderly in nursing consultation [30].

Listening
Listening was reported in seven studies [4,51,54,56,58,61,65] of which four studies were eligible for quality appraisal and scored 100% on the MMAT assessment.
In one instance, listening was reported as a means to help nurses assess older adults' physical condition more effectively [61]. Active listening coupled with compassionate listening was a strategy to support nurses' communication with older adults [4], and proven to be helpful [65]. Emphatic, non-judgmental listening, while being aware of the body language of the older adults, provided pointers to help nurses listen to the needs and concerns of their clients [56].
Actively listening to older adults' verbal and NVC behaviors was seen as leading to individualized care and a sign of respect to older adults in a study characterizing the meaning of and experiences with individualized care from the perspectives of both nursing aides and nursing-home residents [51]. Nursing students, associated active listening in relation to NVC as an empathic response and an open -minded attitude [54].

Artefacts
Artefacts were reported in five of the 22 included studies [4,30,59,61,65] of which three studies eligible for quality appraisal were of high quality.
Artefacts were communication supports and aids that can support nurses' communication with older adults [4]. Artefacts included notes and hands-on learning tools as strategies to improve communication [61] as well as flyers, pamphlets, written instructions, books and education files [65].
When promoting effective communication in practice, it was advised that nurses should be mindful of the physical environment that can affect interactions between them and older adults [4]. The results show that nurses closed the door of an older adult's room to avoid any disturbance of the communication exchange in Sweden [47], while nurses performed their service with the door opened and allowed excessive entry of others into the room while consulting older adults in Brazil [30]. Nurses should guarantee privacy and should avoid speaking while wearing a mask as it is considered as an impediment to effective communication [59].

Chronemics
There was lesser reporting of chronemics and NVC, described in only three studies [19,61,65] and only one study eligible for quality assessment was of good quality [19].
In a study aimed at identifying the communication behaviors and strategies used by socially skilled geriatric nurse aides working with residents in long term care facilities, spending time with older adults was described by the nurses as giving them positive regard, explained as being respectful, acknowledging and showing interest and approval [19]. In a reflection on active listening, spending more time with older patients was mentioned as a means to promote feelings of acceptance, and exercising patience as the most challenging part of the communication process [61]. Likewise, time was found to positively affect nurse practitioners-older adults relationships [65].

Old adults' responses to nurses' NVC behaviors
Six studies [50,51,55,58,59,62] reported on the older adults' responses to nurses' NVC behaviors. The responses were either positive or negative.

Positive responses
Positive responses to nurses' NVC behaviors were reported in three studies [51,58,62]. Comfort touch from nurses was shown to improve the perceptions of selfesteem, well-being, social processes, health status, life satisfaction, self-actualization, and faith or belief [62] while a pat on the shoulder was perceived as a sign of respect [51]. In a study exploring the experience of being listened to, for older adults living in long-term care facilities, results showed they expressed their satisfaction, gratification, and unburdening and described their relationships with the nurses who listened to them as being close like friends or family [58].

Negative responses
Negative responses to nurses' NVC behaviors were reported in four studies [50,51,55,59]. In a study aimed at exploring how communication affects issues relating to residents maintaining cognitive and physical functioning in order to remain in the residence, vocalics were perceived by the nurses as rudeness, disinterest, "infantilisation" and "adultification" [55]. In a study with the aim to determine and compare the communication barriers perceived by older adults and nurses caring for them, speaking far away, without eye contact, wearing a mask and too loud was perceived as being unfriendly, working without a sincere attitude, and showing no respect [59]. In a review of evidence-based strategies for effective communication with older adults across longterm care settings, touching their buttocks or looming over them were perceived by older adults as dominance, while glancing at their watch or down the hall was perceived as a sign of disinterest [50].

Discussion
This systematic scoping review explored evidence on NVC between nurses and older adults, focusing on cognitively intact older adults with no mental illness nor communication impairment. A total of 22 studies were included. Haptics, kinesics, proxemics, and vocalics were the most frequently used NVC strategies by nurses when communicating with older adults, of which 15 scored 100% on MATT. This study's findings further demonstrate a limited use of artefacts and chronemics as forms of NVC. Physical appearance regarding NVC was not mentioned in any of the included studies nor was silence. The results evidenced limited published research in the select topic and in particular for studies located in Asia and Africa, as well as for quantitative studies. Though the majority of studies were qualitative designs, which do not allow generalization of findings, the quality of the included studies ensures credibility.
The majority of the studies included in this review illustrate the different modalities of nurses' NVC behaviors in geriatric nursing care. The most cited NVC behaviors were haptics perhaps because touch is an essential and often unavoidable part of nursing care [66]. Haptics or communication by touch [67] can include aggressive touch, accidental touch, playful touch, task related touch [68] or task-oriented touch, touch promoting physical comfort, and touch providing emotional containment [66,68]. In the included studies, touch was used to joke, to praise, to get attention, to convey attention, to stimulate, and to show care. In one instance, touch was not appreciated by the older adult [52], which highlights that touch can lead to either positive or negative outcomes, depending on the nurses' awareness and intention [69]. Touch can be a nursing tool [70], but nurses need to use touch appropriately, taking into consideration preferences and avoiding its imposition on older adults.
Kinesics are different from haptics in the sense that there is no contact with a person, and only movements of the hands, head, and the body are used. Kinesics were used when words were in short supply, to convey messages, to indicate acceptance or rejection by either party, to resolve disagreements amicably and with speed, to initiate communication, to get attention, and lastly to praise. Gesturing with a meaning of rejection or disapproval as well as abrupt gestures interrupt the exchange of messages [71], highlighting the need for nurses to ensure correct decoding of kinesics [71]. Also, it is important that nurses keep eye contact with older adults during interactions, keeping in mind that the permission of this contact may vary depending on culture [30].
Proxemics included personal space and territoriality [72] and included sitting next to, face-to-face, beside the person, kneeling, looming over, and speaking far away from the person. Proximity can therefore indicate presence, readiness to listen, and a sign of interest in the older adult. Distance can be seen as a barrier to effective communication with older adults. There should be a balance between distance and proximity, with nurses mindful of the often-invasive nature of nursing, and the need to create a therapeutic space where older adults' privacy is not violated.
Vocalics are often associated with "elderspeak", which in addition includes oversimplifying the language, speaking at a slow rate, loud, and with a demeaning tone [73]. In this study, vocalics included speaking with a military or a demeaning tone, speaking too fast or too loud, which led to negative outcomes while speaking calmly or slower led to positive outcomes. Conversely, speaking with a soft tone also led to a negative outcome [57]. In light of the importance of nurses developing selfawareness of the tone that they use to communicate, an opportunity exists for them to use audio recordings to reflect on their tone [3].
Physical appearance was not mentioned in any of the included studies; yet, the clothing worn in nursing is a form of NVC that frequently shapes people's judgments about others, regardless of whether or not the perceptions are true [74]. Therefore, nurses should be aware that the way they present themselves through their uniforms might indirectly communicate something about the care they render.
Positive responses to nurses' NVC behaviors included improved perceptions of self-esteem, well-being, health status, and faith as well as expressed satisfaction and gratification when being listened to by nurses. On the other hand, older adults viewed vocalics used by nurses as a sign of rudeness and disinterest, while nurses who used proxemics were perceived as being unfriendly, working without a sincere attitude, and showing no respect. In order to avoid negative responses from older adults, a level of trust between nurses and older adults needs to precede touch [75]. Though nurses-patients' communication is influenced by conditions that arise in hospital settings, [76], nurses need to adjust their communication style to each situation and each patient [77].

Implications for practice
Awareness of NVC will lead to a greater understanding of the messages exchanged [74]. When the essence of nursing care falls short, all other initiatives are more likely to fail as well [78], implying that if communication with older adults is hindered or tampered with, everything else nurses engage in is likely to fail. Nurses need to be self-aware of their NVC as well as the way in which the meanings of the messages might be misinterpreted, highlighting a need for interventions to aid nurses to interact and communicate holistically with older adults [79]. Additionally, when nurses are aware that older adults are not a homogenous group subject to general assumptions of care [4], communication barriers created by nurses create barriers [61] would be avoided.

Implications for education
An emphasis should be placed on teaching effective communication to prepare future healthcare providers to minimize miscommunication, deliver safe, quality care, and contribute to anti-ageism measures. Also, the training of nurse on NVC will enable the establishment of bonds with older adults and culminate in effective care [49]. Preparation of the neophytes will ensure a sustainable, older-person centered and appropriately trained workforce as advocated by the WHO (2016) [43].

Implications for research
This scoping review draws attention to the limited evidence, specific to NVC between nurses and older adults without mental illness, or communication impairment, indicating a gap in literature, in particular in Asian and African countries. In addition, this review highlights the need for further research to provide an African insight into NVC to answer the WHO call for more data to understand the needs and the status of older adults in Africa [80]. We further recommend a study to determine the impact of nurses' NVC behaviors on older adults' satisfaction and safety of care. Though time constraints can sometimes prevent nurses from providing the attentive communication older adults seek, it is important that nurses identify their own style of NVC and understand how to modify, when necessary, their interactions with patients, in particular older persons.

Strengths and limitations Strengths
This study is possibly the first scoping review to map evidence on NVC between nurses and older adults with neither mental illness nor communication impairment. This study demonstrated a substantial gap in the NVC literature to guide future research on older adults with no mental illness or communication impairment. The study's methodology also allowed the inclusion of different study designs, and the identification of relevant studies methodically charting, and analyzing the outcomes.

Limitations
Despite the inclusion of MeSH terms, it is possible that research on NVC existed under different terminologies, which were not captured in this review. As only abstracts written in English and French were included, some relevant studies may have been missed. Several studies of NVC between nurses and older adults may have been reported only in contexts of mental illnesses or communication deficiencies, leading to their exclusion from this review. Additionally, studies on NVC between other healthcare workers and older adults have not been reviewed.

Conclusions
This study explored evidence on NVC between nurses and older adults with no mental illness nor communication impairment. The results revealed that haptics, kinesics, proxemics, and vocalics were the most frequently used NVC strategies by nurses while there was a limited use of artefacts and chronemics as forms of NVC. Furthermore, physical appearance and silence were not mentioned in any of the 22 included studies. Nurses used NVC strategies to joke, to praise, to get or convey attention, to stimulate, to show care, to indicate acceptance or rejection, to resolve disagreements amicably, to initiate communication, to indicate presence, readiness to listen, and a sign of interest in the older adults. Lastly, older adults responded to nurses' NVC behaviors either in a positive way or in a negative way.