Table 2

Crude and adjusted odds ratios (OR) for low birth weight by pollution exposure

Exposure
Crude odds ratio
Adjusted* odds ratio
Adjusted† odds ratio



OR (95%CI)
OR (95%CI)
OR (95%CI)

Formaldehyde Categorical variable (tertiles)

1 (reference)



2
1.27 (0.82–1.95)
1.86 (1.10–3.16)
2.15 (0.96–4.81)
3
1.39 (0.91–2.12)
1.84 (1.12–3.03)
2.09 (1.03–4.26)

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


1.07 (0.74–1.53)
1.10 (0.75–1.64)
1.36 (0.75–2.47)

Nitrogen dioxide Categorical variable (tertiles)

1 (reference)



2
0.95 (0.61–1.47)
1.11 (0.70–1.77)
0.96 (0.47–1.96)
3
1.37 (0.91–2.07)
1.64 (1.04–2.58)
1.54 (0.80–2.96)

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


1.15 (0.97–1.36)
1.23 (1.02–1.48)
1.28 (0.97–1.68)

* Adjusted for parity, maternal age (≤ 19, 20–29, 30–34, ≥ 35), marital status, education, season of birth, maternal and paternal smoking † As above plus gestational age

Maroziene and Grazuleviciene Environmental Health: A Global Access Science Source 2002 1:6   doi:10.1186/1476-069X-1-6