Table 4.
Relative risks for maternal and perinatal outcomes by completed week of gestation vs. 39 weeks
| Outcomes | 40 0/7 to 40 6/7 weeks | 41 0/7 to 42 2/7 weeks | ||
|---|---|---|---|---|
| vs. 39 0/7 to 39 6/7 weeks | vs. 39 0/7 to 39 6/7 weeks | |||
| RR (95%CI) | aRR (95%CI) | RR (95%CI) | aRR (95%CI) | |
|
| ||||
| Maternal outcomes * | ||||
|
| ||||
| Cesarean delivery | 1.27 (1.06, 1.51) | 1.25 (1.05–1.49) | 2.16 (1.80, 2.60) | 1.93 (1.61–2.32) |
|
| ||||
| Hypertensive disorders of pregnancy | 0.74 (0.60, 0.91) | 0.71 (0.58–0.88) | 0.66 (0.48, 0.89) | 0.61 (0.45–0.82) |
|
| ||||
| Peripartum infection | 1.11 (0.91, 1.36) | 1.14 (0.93–1.39) | 1.08 (0.83, 1.41) | 1.12 (0.86–1.45) |
|
| ||||
| Maternal Composite | 0.60 (0.33, 1.09) | 0.66 (0.36–1.21) | 1.22 (0.64, 2.30) | 1.36 (0.71–2.61) |
|
| ||||
| Perinatal-neonatal outcomes † | ||||
|
| ||||
| Perinatal composite | 1.15 (0.80, 1.65) | 1.13 (0.79–1.62) | 1.61 (1.06, 2.45) | 1.56 (1.02–2.37) |
|
| ||||
| NICU admission | 1.11 (0.89, 1.14) | 1.09 (0.87–1.36) | 1.32 (1.01, 1.74) | 1.26 (0.96–1.66) |
aRR, adjusted relative risk; CI, confidence interval; NICU, neonatal intensive care unit.
Bold indicates p<0.05 for unadjusted comparisons, p<0.0125 for adjusted co-primary outcome comparisons (cesarean and perinatal composite), and significance for adjusted comparisons of secondary outcomes after controlling for multiple comparisons with the false discovery rate method.
*
Models adjusted for maternal age, smoking, and BMI at first clinic visit.
†
Models adjusted for maternal age, smoking, BMI at first clinic visit, and fetal sex.