Table 2 Sample characteristics.

From: An observational claims data analysis on the risk of maternal chronic kidney disease after preterm delivery and preeclampsia

  

f

%

Number of births

1

134,805

52.36

2

101,625

39.47

 ≥ 3

21,051

8.18

Missing

0

0.00

Birth mode

C-Section

80,635

31.32

Vaginal

175,679

68.23

Undefined

85

0.03

Missing

1,082

0.42

Obesity / dyslipidemia

False

206,541

80.22

True

50,940

19.78

Missing

0

0.00

(Gestational) Diabetes

False

211,730

82.23

True

45,751

17.77

Missing

0

0.00

Preterms

False

240,533

93.42

True

16,948

6.58

Missing

0

0.00

Preeclampsia

False

243,033

94.39

True

14,448

5.61

Missing

0

0.00

Mild / moderate CKD

False

255,904

99.39

True

1,577

0.61

Missing

0

0.00

Severe CKD

False

257,291

99.93

True

190

0.07

Missing

0

0.00

  1. f = frequency; % = percentage of N = 257,481.
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