Table 1

Sociodemographic and Reproductive Characteristics of the Study Population, Lima, Peru, 2004–2005

Characteristics

Preeclampsia Cases (N = 339)

Control Subjects (N = 337)

P-value


n

%

n

%


Maternal age at delivery (years)

27.0 ± 7.1*

25.7 ± 5.8

0.01

Maternal age at delivery (years)

< 20

44

13.0

34

10.1

0.003

20–34

229

67.5

265

78.6

≥ 35

66

19.5

38

11.3

Maternal education ≤ 12 years

289

85.3

300

89.0

NS

Single married status

81

24.2

45

13.4

< 0.01

Employed during pregnancy

134

39.5

98

29.1

0.02

Nullipara

160

47.2

117

34.7

< 0.05

No prenatal vitamins

68

20.1

59

17.5

NS

Gestational age at delivery (weeks)

37.4 ± 3.1 *

39.0 ± 2.2

< 0.001

< 28

6

1.8

3

0.9

< 0.001

28–33

35

10.3

7

2.1

34–36

48

14.2

11

3.2

≥ 37

250

73.7

316

93.8

Infant birth weight (grams)

2852.9 ± 830.6 *

3248.2 ± 621.1

< 0.001

Pre-pregnancy body mass index (kg/m2)

24.8 ± 4.4 *

23.1 ± 3.3

< 0.001

Pre-pregnancy body mass index (kg/m2)

< 19.8 (lean)

32

9.4

29

8.6

< 0.001

19.8–26.0 (normal)

182

53.7

245

72.7

26.1–29.0 (overweight)

60

17.7

34

10.1

> 29.0 (obese)

53

15.6

16

4.7

Missing

12

3.5

13

3.9

Delivery mode

Vaginal delivery

108

31.9

318

94.4

< 0.001

Cesarean delivery

230

67.9

19

5.6


We employed a two-sample Student's t-test to compare the continuous variables between preeclampsia cases and controls; and Chi-square tests or Fisher's exact tests were used to compare the categorical variables between the two groups.

NS = not statistically significant.

* Mean ± SD (standard deviation)

Qiu et al. BMC Women's Health 2007 7:15   doi:10.1186/1472-6874-7-15

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