Table 1 Sample characteristics

Age at baseline, y

25.87 ± 4.33

Ethnic minority

49.4

Schooling, y

9.66 ± 2.92

IQ score

86.60 ± 16.92

Depressive score

1.91 ± 3.06

Types of preconception supplementation, %

FA

32.80

IFA

32.36

MM

34.84

Household characteristics

Wealth index

0.02 ± 0.95

Home quality environment score at 1y (range 0-100)

63.28 ± 8.32

Home quality environment score at 6-7y (range 0-100)

56.00 ± 12.60

Child characteristics at 1y measurement

Age, m

12.89 ± 0.74

Girls, %

49.81

HAZ

-0.87 ± 1.04

Stunting, %

13.07

Child characteristics at 2y measurement

Age, m

24.41 ± 0.90

Girls, %

49.54

Child characteristics at 6-7y measurement

Age, m

77.45 ± 3.93

Girls, %

48.46

Attend preschool at least 1y, %

10.71

Attend kindergarten at least 1y, %

96.77