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Table 4 Logistic regression of factors associated with preterm birth, Ohio 2007-2010

From: Exposure to airborne particulate matter during pregnancy is associated with preterm birth: a population-based cohort study

  Adjusted odds ratio2 95 % confidence interval
Maternal age, years   
<20 0.93 0.84, 1.02
 20–24 0.99 0.94, 1.05
 25–29 1.00 Referent
 30–34 1.04 0.97, 1.10
 35–39 1.27 1.19, 1.36
 ≥40 1.52 1.37, 1.69
Maternal race   
 Non-Hispanic white 1.00 Referent
 Non-Hispanic black 1.46 1.36, 1.57
 Hispanic 1.10 1.01, 1.18
 Other Non-Hispanic 1.02 0.88, 1.18
Maternal education level   
 Less than high school 1.13 1.07, 1.19
 High school only 1.23 1.17, 1.29
 Postsecondary education 1.00 Referent
Prenatal care initiation   
 First trimester 1.00 Referent
 Second trimester 0.97 0.94, 1.01
 Third trimester 0.94 0.85, 1.05
 No prenatal care 2.51 2.22, 2.84
Tobacco Use 1.28 1.22, 1.35
High PM2.5 exposure2   
 Average over pregnancy 1.19 1.09, 1.30
 First trimester 1.02 0.97, 1.07
 Second trimester 0.96 0.90, 1.01
 Third trimester 1.28 1.20, 1.37
  1. 1. Odds ratio estimates for covariates are adjusted for other factors listed in the first column of the table as well as parity, infant sex, year of birth, season of birth, and insurance type in the model with high average PM2.5 exposure over pregnancy
  2. 2. The odds ratio estimates for first, second, third trimester high Pm2.5 exposure are from separate models with adjustment for the same covariates as listed above