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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.