Table 3.
Unweighted Data | Weighted Dataa | |||
---|---|---|---|---|
RR | 95% CI | RR | 95% CI | |
Unadjusted | 2.76 | 2.25, 3.37 | 2.48 | 2.01, 3.07 |
Adjustedb | 2.59 | 2.12, 3.15 | 2.36 | 1.92, 2.91 |
Abbreviations: CI – confidence interval; RR – risk ratio
Weighted to reflect the distribution of maternal, pregnancy, and placental characteristics observed among those with their first placenta submitted to pathology (inverse probability weighting)
Adjusted for maternal race/ethnicity, interpregnancy interval, and maternal age at delivery and parity at the first study pregnancy