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Table 2 ORs (95%CI) for PROM and PPROM per 10 μg/m3 Increase in PM2.5 in each trimester and across the whole pregnancy (N = 4364)

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

CrudeModel IaModel IIb
PROM
 1st trimester1.02 (0.97, 1.06)1.00 (0.95, 1.05)1.14 (1.02, 1.26) c
 2nd trimester1.00 (0.96, 1.05)1.09 (1.00, 1.18)1.09 (1.00, 1.18) d
 3rd trimester1.03 (0.99, 1.08)1.03 (0.98, 1.08)1.13 (1.03, 1.24) e
 Whole pregnancy1.09 (0.99, 1.20)1.35 (1.12, 1.63)
PPROM
 1st trimester1.04 (0.95, 1.13)0.97 (0.87, 1.09)1.17 (0.94, 1.45) c
 2nd trimester1.05 (0.96, 1.14)1.12 (0.93, 1.35)1.11 (0.92, 1.33) d
 3rd trimester1.07 (0.98, 1.18)1.07 (0.97, 1.18)1.19 (0.99, 1.44) e
 Whole pregnancy1.31 (1.06, 1.62)1.53 (1.03, 2.27)
  1. OR Odds Ratio, CI Confidence Interval
  2. PROM Premature rupture of membranes, PPROM Preterm premature rupture of membranes
  3. aModel I adjusted for: year of birth, season of conception, maternal age, parity, maternal anemia, preeclampsia, gestational diabetes, and history of obstetrical-gynecological pathology
  4. bModel II adjusted for Model I plus mean concentration of PM2.5 in the other two trimesters
  5. cModel I plus mean concentration of PM2.5 in the 2nd and 3rd trimesters
  6. dModel I plus mean concentration of PM2.5 in the 1st and 3rd trimesters
  7. eModel I plus mean concentration of PM2.5 in the 1st and 2nd trimesters