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Table 3 Threshold Effect for PROM and PPROM per 10 μg/m3 Increase in PM2.5 across the whole pregnancy (N = 4364)a

From: Maternal exposure to ambient fine particulate matter and risk of premature rupture of membranes in Wuhan, Central China: a cohort study

 ORs (95% CI)
PROM
 PM2.5 < 46 (μg/m3)0.18 (0.03, 1.34)
 PM2.5 ≥ 46 (μg/m3)1.43 (1.17, 1.73)
PPROM
 PM2.5 < 63 (μg/m3)1.15 (0.71, 1.85)
 PM2.5 ≥ 63 (μg/m3)2.42 (1.31, 4.46)
  1. OR Odds Ratio, CI Confidence Interval
  2. PROM Premature rupture of membranes, PPROM Preterm premature rupture of membranes
  3. aAdjusted for: year of birth, season of conception, maternal age, parity, maternal anemia, preeclampsia, gestational diabetes, and history of obstetrical-gynecological pathology (Model I)