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Table 2 Hypothesised differences between antenatal education exposure groups for whose detection the EMA study has a statistical power greater than 80%

From: Design and process of the EMA Cohort Study: the value of antenatal education in childbirth and breastfeeding

N = 616 Group A (0 sessions) n = 45 (7.3) Group B (1–4 sessions) n = 62 (10.1) Group C (≥ 5 sessions) n = 509 (82.6)
Visiting hospital for false labour 31% 22% 14%
Anxiety: HAD scale 55% 48% 35%
Mean duration of dilation. (SD 201 min) 470 425 375
Mean duration of expulsion period (SD 68 min) 100 85 70
Dilation in epidural anaesthesia. (SD 1.28 cm.) 3.4 3.7 4
Anaesthesia administered in latent birth stage 39% 30% 20%
Instrumental deliveries 30% 20% 13%
Episiotomy in normal births 55% 48% 35%
Breastfeeding at one and a half months 55% 64% 75%
Breastfeeding at 3 months 48% 58% 69%
Breastfeeding at 6 months 24% 35% 47%