Table 1.
Distribution of gestational age, maternal age, and maternal weight in singletons and twins
| Table 1. Demographics | Singleton (n = 121,446) | MZ (n = 1,454) | DZ (n = 3,161) | P |
|---|---|---|---|---|
| GA (days) |
All group comparison <0.0001 |
|||
| Mean ± SD | 90.4 ± 17.1 | 92.2 ± 17.9 | 91.9 ± 13.5 | |
| Median | 86 | 87 | 87 | |
| Maximum | 146 | 145 | 146 | |
| Minimum | 70 | 70 | 70 | |
| MA (years) |
DZ vs singleton <0.0001 |
|||
| Mean ± SD | 31.7 ± 6.0 | 31.9 ± 5.7 | 32.9 ± 5.1 | |
| Median | 32 | 32 | 34 | |
| Maximum | 57 | 45 | 47 | |
| Minimum | 12 | 14 | 16 | |
| MW (pounds)lbs |
DZ vs singleton <0.0001 |
|||
| Mean ± SD | 160.0 ± 42.3 | 160.7 ± 43.5 | 165.3 ± 43.2 | |
| Median | 150 | 150 | 155 | |
| Maximum | 510 | 363 | 402 | |
| Minimum | 75 | 93 | 83 |
Note. P < .05 considered statistically significant.
Abbreviations: DZ, dizygotic; GA, gestational age; MA, maternal age; MW, maternal weight; MZ, monozygotic.