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Table 3 Crude and adjusted odds ratios (OR) and for premature birth by pollution exposure

From: Maternal exposure to low-level air pollution and pregnancy outcomes: a population-based study

Exposure

Crude odds ratio

Adjusted* odds ratio

 

OR (95%CI)

OR (95%CI)

Formaldehyde Categorical variable (tertiles)

1 (reference)

  

2

0.98 (0.68–1.40)

1.11 (0.72–1.71)

3

1.16 (0.82–1.63)

1.37 (0.91–2.05)

Continuous variable (per 5 μg/m3 increase in concentration)

 

1.03 (0.76–1.40)

1.07 (0.77–1.49)

Nitrogen dioxide Categorical variable (tertiles)

1 (reference)

  

2

1.01 (0.70–1.46)

1.14 (0.77–1.68)

3

1.40 (0.99–1.98)

1.68 (1.15–2.46)

Continuous variable (per 10 μg/m3 increase in concentration)

 

1.16 (1.01–1.34)

1.25 (1.07–1.46)

  1. * Adjusted for parity, maternal age (≤ 19, 20–29, 30–34, ≥ 35), marital status, education, season of birth, maternal and paternal smoking
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Environmental Health

ISSN: 1476-069X