Table 2.
Neonatal characteristics by parity
| Nulliparous | Parous | Total | Nulliparous vs. parous p-valuea |
||
|---|---|---|---|---|---|
| 1 to 3 | 4 or more | ||||
| Study population | 8742 | 5703 | 676 | 15,121 | |
| Gender, N (%) | 0.0703 | ||||
| Male | 4551 (52.1) | 2914 (51.1) | 335 (49.6) | 7800 (51.6) | |
| Female | 4191 (47.9) | 2789 (48.9) | 341 (50.4) | 7321 (48.4) | |
| Gestational age, N (%) | 0.0072 | ||||
| Preterm (< 37 weeks) | 992 (11.3) | 674 (11.8) | 105 (15.5) | 1771 (11.7) | |
| Term (≥ 37 weeks) | 7750 (88.7) | 5029 (88.2) | 571 (84.5) | 13,350 (88.3) | |
| Birth weight categories, N (%) (g) | < 0.0001 | ||||
| < 1500 | 72 (0.8) | 40 (0.7) | 4 (0.6) | 116 (0.8) | |
| 1500–2000 | 470 (5.4) | 175 (3.1) | 28 (4.1) | 673 (4.5) | |
| 2001–2500 | 2054 (23.5) | 922 (16.2) | 101 (14.9) | 3077 (20.3) | |
| ≥ 2501 | 6146 (70.3) | 4566 (80.1) | 543 (80.3) | 11,255 (74.4) | |
| Mean (SD) | 2738.7 (445.8) | 2840.4 (427.5) | 2907.4 (478.6) | 2784.6 (444.0) | < 0.0001 |
| Neonatal deaths < 28 days, N (Rate /1000) | 242 (27.7) | 98 (17.2) | 14 (20.7) | 354 (23.4) | 0.0006 |
ap-values for categorical maternal characteristics are based on Cochran–Mantel–Haenszel tests of each characteristic and nulliparous vs. parous stratified by cluster, while p-values for continuous maternal characteristics are based on t-tests comparing the difference in the means of nulliparous vs. parous for each characteristic