Table 4.

Association between self-reported truck traffic on the street of residence and symptoms in 6- to 7-year-old children.

	No.			OR (95% confidence interval)
Group/symptom	Country	Center	Total	High vs. never	Medium vs. never	Low vs. never
All study participantsa
Current wheeze	29	70	197,515	1.46 (1.36–1.56)	1.31 (1.24–1.39)	1.09 (1.03–1.15)
Asthma ever	29	70	197,515	1.32 (1.23–1.42)	1.21 (1.14–1.28)	1.04 (0.98–1.10)
Severe asthma symptoms	29	69	194,932	1.64 (1.49–1.80)	1.33 (1.22–1.45)	1.08 (1.00–1.17)
Rhinoconjunctivitis	29	70	197,515	1.44 (1.34–1.54)	1.24 (1.17–1.32)	1.07 (1.01–1.13)
Eczema	28	69	194,622	1.37 (1.28–1.48)	1.20 (1.13–1.28)	1.08 (1.02–1.14)
Study participants with complete confounder dataa,b
Current wheeze	21	45	100,554	1.48 (1.34–1.63)	1.35 (1.25–1.46)	1.08 (1.01–1.16)
Asthma ever	21	45	100,554	1.28 (1.16–1.42)	1.19 (1.10–1.28)	1.02 (0.95–1.10)
Severe asthma symptoms	21	45	100,554	1.65 (1.45–1.89)	1.35 (1.21–1.51)	1.07 (0.97–1.19)
Rhinoconjunctivitis	21	45	100,554	1.43 (1.29–1.59)	1.20 (1.10–1.30)	1.01 (0.93–1.09)
Eczema	21	45	100,554	1.42 (1.29–1.56)	1.21 (1.11–1.31)	1.08 (1.00–1.16)
Study participants with complete confounder data, adjusted for potential confoundersa,b,c
Current wheeze	21	45	100,554	1.35 (1.22–1.48)	1.27 (1.17–1.38)	1.05 (0.98–1.13)
Asthma ever	21	45	100,554	1.20 (1.09–1.33)	1.13 (1.05–1.23)	1.00 (0.93–1.08)
Severe asthma symptoms	21	45	100,554	1.41 (1.23–1.62)	1.23 (1.10–1.38)	1.03 (0.93–1.14)
Rhinoconjunctivitis	21	45	100,554	1.33 (1.20–1.48)	1.14 (1.05–1.24)	0.99 (0.91–1.07)
Eczema	21	45	100,554	1.36 (1.23–1.50)	1.18 (1.09–1.28)	1.07 (0.99–1.15)

^aAdjusted for sex, region of the world, language, and GNI.

^bCenters were included if ≥ 70% data available for all covariates; analysis was restricted to those with complete data for all covariates.

^cAlso adjusted for maternal education, cooking fuel, maternal and paternal smoking, television watching, exercise, siblings (older and younger), fast food consumption, and paracetamol use.