Is public transport a risk factor for acute respiratory infection?

BMC Infectious Diseases

Table 2 Odds ratios for the association between bus/tram use and ARI (n = 127)

Exposure	Cases (n = 67)	Controls (n = 60)	Unadjusted OR (95% CI)	Model 1^a: Adjusted OR (95% CI)	Model 2: Adjusted OR (95% CI)
Bus/tram usage in previous 5 days:
No	33 (49%)	31 (52%)	1.00	1.00	1.00
Yes	34 (51%)	29 (48%)	1.10 (0.55-2.21)	1.09 (0.50-2.38)	5.94 (1.33-26.5)^b
Frequency of public transport use:
<once a week	40 (60%)	24 (40%)	1.00	1.00	1.00
1-3 times a week	9 (13%)	20 (33%)	0.27 (0.11-0.69)	0.27 (0.10-0.74)	0.54 (0.15-1.95)^c
>3 times a week	18 (27%)	16 (27%)	0.68 (0.29-1.57)	0.81 (0.32-2.08)	0.37 (0.13-1.06)^c
			p-trend = 0.196	p-trend = 0.463	p-trend = 0.057

Missing data have been excluded from the analysis; statistically significant results in bold; ^a adjusted for age, gender and co-morbidity; ^b adjusted for age, gender, co-morbidity, deprivation, child cohabitation, flu vaccination and frequency of habitual public transport use; ^c adjusted for age, gender, co-morbidity, child cohabitation, flu vaccination and deprivation

ISSN: 1471-2334