Table 1 Sociodemographic characteristics

Baseline characteristics

Mean maternal age, years (± SD)

24.6 ± 5.5

24.5 ± 5.7

25.6 ± 6.1

< 20

172

229

58

20–35

638

738

254

> 35

38

44

23

Educational level

Any primary school

59

85

16

Some high school

565

698

193

Completed high school

187

183

100

Beyond high school

37

43

25

Pregnancy Body Mass Index (BMI)

Underweight (BMI < 18.5)

53

84

14

Normal (BMI 18.5 - <25.0)

458

544

134

Overweight (BMI 25.0 to < 30.0)

176

200

77

Obese (BMI 30.0 to < 35.0)

78

95

53

Morbidly obese (BMI ≥ 35.0)

65

68

43

Gestational age at delivery

< 28 weeks

13

17

3

28 weeks to 31 weeks 6 days

6

7

2

32 weeks to 36 weeks 6 days

84

106

29

> 37 weeks

745

881

301

Infant characteristics

Mean birth weight, grams (± SD)

2951 ± 600

2938 ± 596

3129 ± 605

< 1500

21

24

4

1500 to < 2500

129

158

34

2500 to < 4000

672

799

272

≥ 4000

18

22

22

Sex

Male

404

472

179

Female

444

539

156