Table 1 Characteristics of mothers and twin births included in the twins perinatal mortality study
Characteristic | Mothers | Twins | |
|---|---|---|---|
First Born | Second Born | ||
Mothers, n (%) | 188480 | ||
Race | |||
White | 149459 (79.3) | ||
Black | 31912 (16.9) | ||
Other | 7109 (3.8) | ||
Age | |||
< 20 | 13192 (7.0) | ||
20–34 | 140992 (74.8) | ||
≥ 35 | 34296 (18.2) | ||
Newbornsa | 188480 | 188480 | |
Sex, boy | 94326 (50.1) | 94654 (50.2) | |
Gestational age, week | 35.7 (3.2) | 35.7 (3.2) | |
Birth weight, gram | 2407.5 (615.5) | 2383.9 (618.5) | |
Breech/Malpresentation | 40832 (21.7) | 51661 (27.4) | |
Cesarean | 100271 (53.2) | 108413 (57.5) | |