Table 1.
Paternal, maternal, and infant characteristics of cohort.
| Characteristic | n (%) |
|---|---|
| Paternal age, y | |
| Mean ± SD | 35.4 ± 5.4 |
| <30 | 122035 (12.2) |
| 30–39 | 674159 (67.4) |
| ≥40 | 203692 (20.4) |
| Maternal, y | |
| Mean ± SD | 33.2 ± 4.4 |
| <30 | 213,175 (21.3) |
| 30–39 | 698,707 (69.9) |
| ≥40 | 88,004 (8.8) |
| Births | |
| Total | 999,866 |
| Live birth | 785,809 (78.6) |
| Pregnancy loss | 214,057 (21.4) |
| Preterm birth | 51,759 (5.2) |
| Year of birth | |
| 2009 | 107,287 (10.73) |
| 2010 | 128,692 (12.87) |
| 2011 | 158,069 (15.81) |
| 2012 | 164,106 (16.41) |
| 2013 | 134,818 (13.48) |
| 2014 | 135,247 (13.53) |
| 2015 | 90,747 (9.08) |
| 2016 | 80,920 (8.09) |
| Region of childbirth | |
| Northeast | 199,322 (19.93) |
| North Central | 245,597 (24.56) |
| South | 327,569 (32.76) |
| West | 210,050 (21.01) |
| Unknown | 17,348 (1.73) |