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) |