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

From: Is public transport a risk factor for acute respiratory infection?

Exposure Cases
(n = 67)
Controls
(n = 60)
Unadjusted OR
(95% CI)
Model 1a: 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
  1. 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