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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

Crude

Model Ia

Model IIb

PROM

 1st trimester

1.02 (0.97, 1.06)

1.00 (0.95, 1.05)

1.14 (1.02, 1.26) c

 2nd trimester

1.00 (0.96, 1.05)

1.09 (1.00, 1.18)

1.09 (1.00, 1.18) d

 3rd trimester

1.03 (0.99, 1.08)

1.03 (0.98, 1.08)

1.13 (1.03, 1.24) e

 Whole pregnancy

1.09 (0.99, 1.20)

1.35 (1.12, 1.63)

PPROM

 1st trimester

1.04 (0.95, 1.13)

0.97 (0.87, 1.09)

1.17 (0.94, 1.45) c

 2nd trimester

1.05 (0.96, 1.14)

1.12 (0.93, 1.35)

1.11 (0.92, 1.33) d

 3rd trimester

1.07 (0.98, 1.18)

1.07 (0.97, 1.18)

1.19 (0.99, 1.44) e

 Whole pregnancy

1.31 (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