Sample Size
We determined the sample size for this trial based on our primary outcome, maternal knowledge. We used a significance level of .05 (We hypothesized that, at the 2-week data collection time point, the mean score of participants in the control group on the knowledge questionnaire would be 43% (12 points out of 28 points in the survey), while the mean score of the intervention group on this questionnaire would be 61% (17 out of 28 points). This would constitute an 18% absolute increase and a 1.41-times relative increase. We calculated a sample size of n=140 for each study arm, then added 50% to account for participant dropouts and loss to follow-up. This brought our sample size to n=210 for the intervention group and n=210 for the control group. Thus, we estimated a total sample size of N=420 participants for the trial. We carried out these sample size calculations on G-Power 3.1.9.6, based on the difference between 2 independent proportions, using a 