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Table 4 Adjusted ORs (95% CI) for PROM and PPROM associated with 10 μg/m3 Increase in PM2.5 and with quartiles of PM2.5 (relative to the lowest quartile) in the last week and last day of 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

 PROMPPROM
Last week of pregnancy
 PM2.5 (10 μg/m3)1.01 (0.97, 1.04)1.04 (0.96, 1.12)
 < 37.51.01.0
 37.5 to < 750.79 (0.60, 1.05)1.01 (0.55, 1.85)
 75 to < 112.50.84 (0.63, 1.11)0.83 (0.43, 1.59)
 ≥112.51.00 (0.74, 1.34)1.36 (0.71, 2.61)
Last day of pregnancy
 PM2.5 (10 μg/m3)1.02 (1.00, 1.05)1.04 (0.99, 1.10)
 < 591.01.0
 59 to < 1180.99 (0.75, 1.30)0.95 (0.52, 1.74)
 118 to < 1770.90 (0.68, 1.20)0.96 (0.51, 1.78)
 ≥1771.28 (0.96, 1.69)1.44 (0.78, 2.66)
  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