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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