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Table 3 Odd Ratios and 95% CIs of categorial PTB for per 10 μg/m3 increase in PM2.5 during each time window based on LUR model estimates

From: Maternal PM2.5 exposure triggers preterm birth: a cross-sectional study in Wuhan, China

 

N

Crude model

Adjusted model a

OR (95% CI) value

p value

OR (95% CI) value

p value

PTB

273

    

 Entire pregnancy

 

1.191 (1.097, 1.285)

< 0.001

1.263 (1.158, 1.368)

< 0.001

 First trimester

 

1.127 (1.069, 1.185)

< 0.001

1.169 (1.077, 1.262)

< 0.001

 Second trimester

 

1.039 (1.001, 1.077)

0.040

1.056 (1.015, 1.097)

0.007

 Third trimester

 

1.001 (0.967, 1.036)

0.937

1.052 (1.002, 1.101)

0.041

MPTB

230

    

 Entire pregnancy

 

1.183 (1.081, 1.286)

< 0.001

1.230 (1.118, 1.344)

< 0.001

 First trimester

 

1.107 (1.044, 1.171)

0.001

1.170 (1.071, 1.269)

0.001

 Second trimester

 

1.040 (1.000, 1.080)

0.052

1.051 (1.008, 1.094)

0.021

 Third trimester

 

1.014 (0.977, 1.052)

0.460

1.053 (1.000, 1.106)

0.048

VPTB

41

    

 Entire pregnancy

 

1.192 (0.963, 1.426)

0.101

1.496 (1.222, 1.778)

< 0.001

 First trimester

 

1.203 (0.963, 1.449)

0.098

1.265 (1.116, 1.417)

< 0.001

 Second trimester

 

1.036 (0.946, 1.127)

0.431

1.111 (1.005, 1.218)

0.040

 Third trimester

 

0.924 (0.833, 1.157)

0.104

1.054 (0.925, 1.186)

0.413

  1. Abbreviations: OR odds ratio, CI confidence interval, MPTB moderate preterm births (32–37 weeks), VPTB very preterm births (28–32 weeks)
  2. a Logistic regression model, adjusted for maternal age, years of education, delivery mode, gravidity, parity, season of conception, gestational diabetes, gestational hypertension, and sex of infant
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Global Health Research and Policy

ISSN: 2397-0642

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