Table 2. Elective Birth at 39 Weeks’ Gestation vs Expectant Management and the Risk of Developmental Vulnerability Using Imputed Data.
| Inverse probability weighted regression adjustmenta | Unadjusted risk estimates | ||||
|---|---|---|---|---|---|
| Relative risk (95% CI) | Percentage risk difference (95% CI) | Relative risk (95% CI) | Percentage risk difference (95% CI) | ||
| Primary outcome | |||||
| Developmental vulnerability in 2 or more domains | 1.03 (0.96 to 1.12) | 0.28 (−0.38 to 0.94) | 1.03 (0.95 to 1.13) | 0.28 (−0.42 to 0.99) | |
| Secondary outcomes | |||||
| Physical health and well-being | 0.94 (0.86 to 1.02) | −0.46 (−1.08 to 0.16) | 0.94 (0.86 to 1.03) | −0.43 (−1.1 to 0.24) | |
| Social competence | 1.04 (0.96 to 1.13) | 0.32 (−0.31 to 0.94) | 1.04 (0.95 to 1.14) | 0.32 (−0.36 to 0.99) | |
| Emotional maturity | 1.03 (0.94 to 1.12) | 0.20 (−0.44 to 0.84) | 1.03 (0.94 to 1.12) | 0.18 (−0.50 to 0.86) | |
| Language and cognitive skills (school-based) | 1.02 (0.92 to 1.13) | 0.08 (−0.46 to 0.63) | 1.03 (0.92 to 1.15) | 0.15 (−0.44 to 0.73) | |
| Communication skills and general knowledge | 1.04 (0.94 to 1.14) | 0.22 (−0.33 to 0.77) | 1.04 (0.94 to 1.16) | 0.24 (−0.35 to 0.84) | |
a
Adjusted analyses were pooled from inverse probability weighted regression–adjusted modeling for each imputed data set. Parity, perinatal complications, assisted conception (in vitro fertilization), maternal level of education, socioeconomic position, infant birth weight and sex, child’s age at Australian Early Development Census testing, year of testing, and an interaction term between maternal age and mode of birth were included as covariates.