Table 1 Participant demographics

Male, n (%)

119 (70.0%)

108 (63.5%)

227 (66.8%)

Child’s age in months

26.3 ± 9.6

25.2 ± 10.1

25.8 ± 9.8

Mother’s age in years

31.0 ± 3.5

30.6 ± 3.0

30.8 ± 3.2

Age mother had first child

25.5 ± 3.1

25.8 ± 2.6

25.7 ± 2.9

Mother’s years of education

11.2 ± 3.0

10.8 ± 2.6

11.2 ± 2.8

Number of siblings

2.5 ± 1.1

2.3 ± 1.1

2.4 ± 1.1