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Table 4 Change in the total knowledge scores in sub-group variables of intervention group between pre- and post-training

From: A randomised controlled trial of the effectiveness of a breastfeeding training DVD on improving breastfeeding knowledge and confidence among healthcare professionals in China

Items Number Pre-DVD
mean (SD)
(range 0–12)
Post-DVD
mean (SD)
(range 0–12)
ANOVA
(interaction effect)
ANOVA
(within-subject effect)
Age <30 years 22 5.55 (1.57) 7.18 (1.40) F(2,66) = 0.80
p = 0.45
F(1,66) = 64.33
p < 0.01
30–39 years 35 5.66 (2.16) 7.94 (1.73)
>39 years 12 5.25 (2.53) 7.33 (1.88)
Working hospital Provincial or municipal hospital 35 6.31 (1.81) 7.94 (1.64) F(1,94) = 6.94
p = 0.01
F(1,94) = 102.95
p < 0.01
County hospital or below 61 4.85 (1.97) 7.62 (1.74)
Job type Nurse 46 5.57 (1.97) 7.67 (1.52) F(2,93) =3.06
p = 0.05
F(1,93) = 102.83
p < 0.01
Midwife 18 6.28 (2.05) 8.00 (2.17)
Doctor 32 4.63 (1.90) 7.69 (1.71)
Job title Senior or mid-grade 48 5.71 (2.25) 8.06 (1.93) F(1,94) =0.00
p = 1.00
F(1,94) = 118.52
p < 0.01
Primary 48 5.06 (1.76) 7.42 (1.40)
Years since qualification ≤ 5 years 42 5.48 (1.71) 7.43 (1.53) F(1,93) = 2.67
p = 0.11
F(1,93) = 113.15
p < 0.01
>  5 years 53 5.30 (2.28) 7.96 (1.82)
Years working with BF mothers ≤2 years 23 5.39 (1.85) 7.22 (1.57) F(2,89) = 0.93
p = 0.40
F(1,89) = 100.48
p < 0.01
3–10 years 33 5.09 (1.93) 7.70 (1.69)
> 10 years 36 5.81 (2.27) 8.14 (1.81)
Previous training on breastfeeding Yes 67 5.87 (1.95) 7.96 (1.75) F(1,94) = 3.59
p = 0.06
F(1,94) = 119.62
p < 0.01
No 29 4.28 (1.81) 7.24 (1.53)
  1. Cases were deleted where there was missing data on the independent or dependent variable