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Table 2 Evaluation of the content validity of the IPQ-R HP

From: Development and preliminary evaluation of the validity and reliability of a revised illness perception questionnaire for healthcare professionals

 

Item (dimension)

Experts (n)

Experts with rating 3 of 4

I-CVIa

Pc b

k*c

Evaluationd

1

The illness of my patient is serious (1)

25

23

0.92

0.0000

0.92

Excellent

2

The illness of my patient has major consequences on his/her life (1)

25

25

1.00

0.0000

1.00

Excellent

3

The illness of my patient does not have much effect on his/her life (1)

25

13

0.52

0.1550

0.43

Fair

4

The illness of my patient strongly affects the way others see him/her (1)

25

12

0.48

0.1550

0.38

Poor

5

The illness of my patient has serious financial consequences for him/her (1)

25

18

0.72

0.0143

0.72

Good

6

The illness of my patient causes difficulties for those who are close to him/her (1)

24

21

0.88

0.0001

0.87

Excellent

7

The illness of my patient will last a short time (2)

25

17

0.68

0.0322

0.67

Good

8

The illness of my patient is likely to be permanent rather than temporary (2)

25

24

0.96

0.0000

0.96

Excellent

9

The illness of my patient will last for a long time (2)

25

21

0.84

0.0004

0.84

Excellent

10

The illness of my patient will pass quickly (2)

25

8

0.32

0.0322

0.30

Poor

11

I expect that my patient will have his/her illness for the rest of his/her life (2)

24

19

0.79

0.0025

0.79

Excellent

12

The illness of my patient will improve in time (2)

25

22

0.88

0.0001

0.88

Excellent

13

My patient can do a lot to control his/her symptoms (3)

25

22

0.88

0.0001

0.88

Excellent

14

What my patient does can determine whether his/her illness gets better or worse (3)

25

21

0.84

0.0004

0.84

Excellent

15

The course of my patients’ illness depends on him/her (3)

25

21

0.84

0.0004

0.84

Excellent

16

Nothing my patient does will affect his/her illness (3)

25

19

0.76

0.0053

0.76

Excellent

17

My patient has the power to influence his/her illness (3)

25

18

0.72

0.0143

0.72

Good

18

The actions of my patient will have no effect on the outcome of his/her illness (3)

25

21

0.84

0.0004

0.84

Excellent

19

There is very little that can be done to improve the illness of my patient (4)

25

22

0.88

0.0001

0.88

Excellent

20

The treatment of my patient, will be effective in curing his/her illness (4)

25

23

0.92

0.0000

0.92

Excellent

21

The negative effects of the illness of my patient can be prevented (avoided) by his/her treatment (4)

25

23

0.92

0.0000

0.92

Excellent

22

The treatment of my patient can control his/her illness (4)

25

25

1.00

0.0000

1.00

Excellent

23

There is nothing which can help the condition of my patient (4)

25

18

0.72

0.0143

0.72

Good

24

The illness of my patient is a mystery to him/her (5)

25

23

0.92

0.0000

0.92

Excellent

25

The symptoms of the condition of my patient are puzzling to him/her (5)

25

14

0.56

0.1328

0.49

Fair

26

My patient does not understand his/her illness (5)

25

20

0.80

0.0016

0.80

Excellent

27

The illness of my patient doesn’t make any sense to him/her (5)

25

13

0.52

0.1550

0.43

Fair

28

My patient has a clear picture or understanding of his/her condition (5)

25

23

0.92

0.0000

0.92

Excellent

29

The symptoms of the illness of my patient change a great deal from day to day (6)

24

19

0.79

0.0025

0.79

Excellent

30

The symptoms of my patient come and go in cycles (6)

24

18

0.75

0.0080

0.75

Excellent

31

The illness of my patient is very unpredictable (6)

24

22

0.92

0.0000

0.92

Excellent

32

My patient goes through cycles in which his/her illness gets better and worse (6)

24

20

0.83

0.0006

0.83

Excellent

33

My patient gets depressed when he/she thinks about his/her illness (7)

24

20

0.83

0.0006

0.83

Excellent

34

When my patient thinks about his/her illness he/she gets upset (7)

24

15

0.63

0.0779

0.59

Fair

35

The illness of my patient makes him angry (7)

24

19

0.79

0.0025

0.79

Excellent

36

The illness of my patient does worry him/her (7)

24

19

0.79

0.0025

0.79

Excellent

37

Having this illness makes my patient feel anxious (7)

24

19

0.79

0.0025

0.79

Excellent

38

The illness of my patient makes him/her afraid (7)

24

19

0.79

0.0025

0.79

Excellent

  1. aI-CVI (item content validity index) = number giving a rating of 3 or 4 / number experts
  2. bpc (probability of chance occurrence) = [N!/ A!(N-A)!] x 0,5N where N = number of experts and A = number agreeing on good relevance
  3. ck* = kappa designating agreement on relevance: k* = (I-CVI – pc) / (1 – pc)
  4. dEvaluation criteria for k*: poor = k* < 0.40; fair = k* of 0.40-0.59; good = k* of 0.60-0.74; excellent = k* > 0.74