Table 5

Associations between combined exposure to truck and car transit and cough or phlegm.

Trucks transit

Never

Sometimes

Freq/continuously

Cars transit

Never/sometimes

n cases (%)

426 (5.3)

211 (5.9)

19 (8.2)

OR* (95% CI)

1.00

1.12 (0.95–1.32)

1.50 (0.93–2.43)

Frequently

n cases (%)

168 (6.3)

370 (6.4)

140 (7.7)

OR* (95% CI)

1.09 (0.90–1.33)

1.12 (0.96–1.30)

1.42 (1.15–1.75)

Continuously

n cases (%)

56 (7.8)

228 (8.4)

372 (9.3)

OR* (95% CI)

1.30 (0.94–1.81)

1.42 (1.19–1.70)

1.60 (1.36–1.87)

*All ORs were adjusted for presence of current asthma symptoms, study centre, age, sex, parental asthma or allergies, parental education, passive smoke at home, indoor moulds, season, person filling the questionnaire, floor level of the apartment and change of residence.

Migliore et al. Environmental Health 2009 8:27   doi:10.1186/1476-069X-8-27