Table 1 Sociodemographic characteristics of the participants by BMI (kg/m²) category; 17,738 singleton first or second deliveries. KCMC Medical birth registry July 2000-May 2013

Overall (n)

17,738

1178

11,008

4258

1294

%

23.5

6.6

62.1

24.0

7.3

Mothers age (yrs)

< 0.001

 13-19

 20-24

 25-29

 30-34

 35-50

 Missing

2151

6437

5755

2606

755

34

21.8 (3.2)

22.8 (3.6)

24.0 (4.0)

24.9 (4.2)

25.6 (4.4)

23.9 (3.6)

12.6

7.9

5.1

3.2

2.9

-

72.1

68.3

58.3

51.0

46.5

64.7

13.5

19.5

27.7

33.0

33.8

23.5

1.8

4.3

8.9

12.9

16.8

8.8

Mothers education

< 0.001

 None

 Primary

 Secondary (8-11 yrs)

 Higher (12+ yrs)

 Missing

177

9116

1143

7277

26

22.8 (3.3)

23.2 (3.8)

23.2 (4.0)

24.0 (4.1)

23.5 (3.4)

9.0

7.2

8.7

5.6

11.5

69.5

75.5

62.6

57.6

73.1

18.1

21.4

23.1

27.6

15.4

3.4

6.0

6.7

9.1

-

Marital status

< 0.001

 With partner

 Without partner

 Missing

14,807

2866

65

23.6 (3.9)

23.1 (4.1)

24.3 (4.4)

6.2

8.9

4.6

61.8

63.4

58.5

24.7

20.7

24.6

7.3

7.0

12.4

Mother’s occupation

< 0.001

 Housewife

 Farmer

 Service

 Business

 Professional

 Student

 Missing

3567

2784

1286

4125

3790

592

1594

23.0 (3.7)

22.5 (3.5)

23.8 (3.9)

24.2 (4.2)

24.2 (4.0)

22.4 (3.8)

23.1 (3.8)

8.2

9.1

5.2

5.4

4.4

12.0

6.8

65.9

70.0

59.9

56.7

57.0

65.4

66.1

20.8

17.3

27.4

27.3

29.1

17.9

21.9

5.1

3.6

7.5

10.7

9.6

4.7

5.2

Mothers tribe

< 0.001

 Chagga

 Pare

 Other

10,164

2044

5530

23.8 (4.0)

23.5 (4.0)

23.0 (3.9)

5.4

7.3

8.7

60.2

62.2

65.4

26.1

23.6

20.2

8.2

6.8

5.7

Antenatal care

< 0.001

  < 4

  ≥ 4

 Missing

8742

8783

213

23.4 (4.0)

23.7 (3.9)

23.1 (3.7)

7.3

5.9

10.3

63.4

60.7

60.1

22.3

25.7

24.9

7.0

7.6

4.7

Mother’s height

< 0.001

  < 155 cm

 155 cm-164

  ≥ 165 cm

4142

9760

3836

23.8 (3.9)

23.5 (4.0)

23.0 (4.0)

5.3

6.2

9.1

64.5

62.6

58.0

23.6

23.5

25.9

6.6

7.7

7.0