Table 3.
Intrapartum and neonatal death rate in males and females by birthweight percentiles and gestational age category
| Male infants | Female infants | RRa | (95% CI) | |||
|---|---|---|---|---|---|---|
| (n = 895 272) | % | (n = 847 559) | % | |||
| Birthweight <p10 (SGA) | ||||||
| 25‐27 wk GA | 61/182 | 34 | 41/97 | 42 | .79 | (0.58‐1.08) |
| 28‐31 wk GA | 68/543 | 13 | 30/307 | 9.8 | 1.28 | (0.85‐1.92) |
| 32‐36 wk GA | 110/4541 | 2.4 | 103/3672 | 2.8 | 0.86 | (0.66‐1.13) |
| 37‐42 wk GA | 263/72 603 | 0.36 | 232/70 354 | 0.33 | 1.10 | (0.92‐1.31) |
| Birthweight p10‐p90 (normal weight) | ||||||
| 25‐27 wk GA | 298/1105 | 27 | 186/826 | 23 | 1.20 | (1.02‐1.40) |
| 28‐31 wk GA | 203/4250 | 4.8 | 173/3272 | 5.3 | 0.90 | (0.74‐1.10) |
| 32‐36 wk GA | 303/41 068 | 0.73 | 202/323 88 | 0.62 | 1.18 | (0.99‐1.41) |
| 37‐42 wk GA | 549/670 786 | 0.08 | 470/639 073 | 0.07 | 1.11 | (0.98‐1.26) |
| Birthweight ≥p90 (LGA) | ||||||
| 25‐27 wk GA | 21/132 | 16 | 36/163 | 22 | 0.72 | (0.44‐1.17) |
| 28‐31 wk GA | 33/440 | 7.5 | 31/397 | 7.8 | 0.96 | (0.60‐1.54) |
| 32‐36 wk GA | 24/2631 | 0.91 | 27/2631 | 1.0 | 0.89 | (0.51‐1.54) |
| 37‐42 wk GA | 64/92 959 | 0.07 | 53/90 632 | 0.06 | 1.18 | (0.82‐1.69) |
| All birthweights | ||||||
| 25‐27 wk GA | 380/1419 | 27 | 263/1086 | 24 | 1.08 | (0.94‐1.25) |
| 28‐31 wk GA | 304/5233 | 5.8 | 234/3976 | 5.9 | 0.99 | (0.84‐1.16) |
| 32‐36 wk GA | 437/48 240 | 0.91 | 332/38 691 | 0.86 | 1.06 | (0.92‐1.22) |
| 37‐42 wk GA | 876/836 348 | 0.10 | 755/800 059 | 0.09 | 1.11 | (1.01‐1.22) |
Abbreviations: CI, confidence interval; GA, gestational age; LGA, large‐for‐gestational age; RR, relative risk ratio; SGA, small‐for‐gestational age.
a
RR calculated as: the numerator is all neonates with intrapartum or neonatal death in each stratum and the denominator all deliveries without antepartum death in each birthweight category.