Comparison of characteristics of intervention and control group
We conducted an independent sample t-test to compare the continuous demographic and obstetric data, including age, income, family size, and first age at menarche, a gestational week at enrollment, and number of ANC visits between the intervention and comparison groups. A chi-square test was used to compare group differences in categorical variables, including level of education, ethnicity, religion, occupation, frequency of TV and radio views, pregnancy intention, menstrual cycle, gravida, and parity.