Table 2.

Baseline characteristics of participants (n = 343)^a

	%
Demographic
Age (years), mean ± SD	30 ± 5
High level of education	66
Full-time job (≥ 32 hours per week)	56
Non-Dutch ethnicity	26
First-time pregnancy	65
Lifestyle
Overweight before pregnancy (BMI ≥ 25)b	19
Smoking during pregnancy
Yes	3
Until pregnancy was known	14
No	84
Alcohol use during pregnancy	17
No use of folic acid supplements	10
Internet
Internet at home	96
Used internet > 1 hour per week	86
Used internet to find pregnancy-related information	87

^aThe total number of participants was 488; response rate for self-completed questionnaire at baseline was 70%.

^bBMI (body mass index) = weight/height²(kg/m²)