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. 2018 Feb 21;18:56. doi: 10.1186/s12884-018-1687-3

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

Characteristics N Mean (SD)
BMI		 BMI < 18.5
Underweight		 BMI 18.5-24.9
Normal		 BMI 25.0-29.9
Overweight		 BMI >=  30
Obese		 χ2
p-value
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