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Table 3 Observed and adjusted odds ratio of preeclampsia according to risk factors;17,738 singleton first or second deliveries. KCMC Medical birth registry July 2000-May 2013

From: The association between pre pregnancy body mass index and risk of preeclampsia: a registry based study from Tanzania

Maternal characteristics

No preeclampsia (n)

Preeclampsia

[n (%)]

Crude

OR (95% CI) P-value

Adjusted*

OR (95% CI) P-value

Mother’s BMI (kg/m2)

   

< 0.001

 

< 0.001

  < 18.5 underweight

1153

25 (2.1)

0.7 (0.5-1.1)

 

0.7 (0.4-1.1)

 

 18.5-24.9 normal

10,694

314 (2.9)

Ref

 

Ref

 

 25.0-29.9 overweight

4077

181 (4.3)

1.5 (1.3-1.8)

 

1.4 (1.2-1.8)

 

 30 thru highest obese

1232

62 (4.8)

1.7 (1.3-2.3)

 

1.8 (1.3-2.4)

 

P for trend

 

< 0.001

 

< 0.001

 

Mother’s age

   

< 0.001

 

< 0.001

 13-19

2090

61 (2.8)

1.1 (0.8-1.5)

 

0.9 (0.7-1.3)

 

 20-24

6268

169 (2.6)

Ref

 

Ref

 

 25-29

5568

187 (3.2)

1.2 (1.0-1.5)

 

1.2 (1.0-1.5)

 

 30-34

2493

114 (4.4)

1.7 (1.3-2.2)

 

1.6 (1.2-2.1)

 

 35-50

706

49 (6.5)

2.6 (1.9-3.6)

 

2.6 (1.8-3.7)

 

P for trend

 

< 0.001

 

< 0.001

 

Mother’s education

   

0.08

 

0.4

 None

172

5 (2.8)

0.8 (0.3-1.9)

 

1.2 (0.5-3.1)

 

 Primary

8839

277 (3.0)

0.8 (0.7-1.0)

 

1.1 (0.9-1.5)

 

 Secondary (8-11)

1111

31 (2.7)

0.7 (0.5-1.1)

 

0.9 (0.6-1.3)

 

 Higher (12+)

7009

268 (3.7)

Ref

 

Ref

 

P for trend

 

0.02

 

0.2

 

Pregnancy number

   

0.06

 

0.001

 First

9992

362 (3.5)

Ref

 

Ref

 

 Second

7164

220 (3.0)

0.8 (0.7-1.0)

 

0.7 (0.6-0.9)

 

Marital status

   

0.003

 

0.02

 With partner

14,348

459 (3.1)

Ref

 

Ref

 

 Without partner

2746

120 (4.2)

0.7 (0.6-0.9)

 

0.8 (0.6-1.3)

 

Mother’s occupation

   

< 0.001

 

0.07

 Housewife

3463

104 (2.9)

1.0 (0.8-1.4)

 

1.0 (0.8-1.4)

 

 Farmer

2704

80 (2.9)

Ref

 

Ref

 

 Service

1227

59 (4.6)

1.6 (1.2-2.3)

 

1.4 (1.0-2.0)

 

 Business

4012

113 (2.7)

1.0 (0.7-1.3)

 

0.8 (0.6-1.1)

 

 Professional

3629

161 (4.2)

1.5 (1.1-2.0)

 

1.2 (0.9-1.7)

 

 Student

573

19 (3.2)

1.1 (0.7-1.9)

 

1.1 (0.6-1.8)

 

Mother’s tribe

   

< 0.001

 

< 0.001

 Chagga

9874

290 (2.9)

Ref

 

Ref

 

 Pare

1951

93 (4.5)

1.6 (1.3-2.1)

 

1.9 (1.4-2.4)

 

 Others

5531

199 (3.6)

1.3 (1.1-1.5)

 

1.5 (1.2-1.8)

 

Mother’s height

   

0.009

 

0.01

  < 155 cm

4017

125 (3.0)

0.7 (0.6-0.9)

 

0.7 (0.6-1.0)

 

 155-164 cm

9459

301 (3.1)

0.8 (0.6-0.9)

 

0.7 (0.6-0.9)

 

  ≥ 165 cm

3680

156 (4.1)

Ref

 

Ref

 

P for trend

 

0.01

 

0.02

 
  1. *All variables are in the multivariable model
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