Table 1.
Infant characteristics among singleton pregnancies with and without maternal asthma (n=223,512), Consortium on Safe Labor, 2002–2008.
| Infant characteristics | No Asthma n=206,468 | Asthma n=17,044 | p-valuea |
|---|---|---|---|
| Sex | |||
| Female | 100644 (48.9) | 8353 (49.1) | 0.62 |
| Male | 105354 (51.1) | 8646 (50.9) | |
| Unknown | 470 (0.2) | 45 (0.3) | |
| Gestational age, weeks (mean, sd) | 38.6 (2.3) | 38.4 (2.5) | <0.0001 |
| Term (37+ weeks) | 182850 (88.6) | 14518 (85.2) | <0.0001 |
| 34–36 weeks | 15719 (7.6) | 1653 (9.7) | |
| 29–33 weeks | 5194 (2.5) | 631 (3.7) | |
| 23–28 weeks | 2705 (1.3) | 242 (1.4) | |
| Route of delivery | |||
| Vaginal | 149199 (72.3) | 11721 (68.8) | <0.0001 |
| Cesarean section (all) | 57269 (27.7) | 5323 (31.2) | <0.0001 |
| Prelabor | 23688 (41.4) | 2193 (41.2) | |
| After induction | 14746 (25.7) | 1381 (25.9) | |
| After spontaneous labor | 18835 (32.9) | 1749 (32.9) | |
| Birth weight, grams (mean, sd)b | 3249.6 (604.4) | 3173.5 (629.6) | <0.0001 |
| Singleton infants per woman | |||
| 1 | 172355 (91.2) | 14074 (90.7) | 0.06 |
| 2 | 15878 (8.4) | 1355 (8.7) | |
| 3 | 724 (0.4) | 80 (0.5) | |
| 4 | 45 (0.02) | 5 (0.03) | |
| 5 | 1 (<.01) | 0 (0.0) | |
Numbers are frequency (%) unless otherwise specified.
a
P-values are based on generalized estimating equations that account for multiple pregnancies to the same woman and adjusted for site.
b
Birth weight was missing or implausible for 2486 infants: 2347 (1.1%) and 139 (0.8%) for neonates of mothers without and with asthma.