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Table 1 Characteristics of the subjects

From: A matched case–control study of preterm birth in one hospital in Beijing, China

 

Control

Case

Gestational weeks

39.1 ± 1.0

33.9 ± 1.9

newborn’s birth weight (g)

3416.0 ± 241.4

2022.3 ± 338.9

Maternal age (years)

29.1 ± 3.3

29.2 ± 3.8

Husband’s age (years)

30.9 ± 4.1

31.0 ± 4.6

History of delivery

 no

153 (88.9)

153 (88.9)

 yes

19 (11.1)

19 (11.1)

  1. History of delivery was showed as n (%), others were showed as Mean ± sd.