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Table 1 Characteristics of cases and controls (n = 138)

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

Characteristic Cases (%)
(n = 72)
Controls (%)
(n = 66)
Unadjusted OR
(95% CI)
Age:    
   1-24 yrs 11 (15) 4 (6) 1.00
   25-45 yrs 32 (44) 16 (24) 0.73 (0.20-2.65)
   46-65 yrs 25 (35) 32 (49) 0.28 (0.10-1.00)
   >65 yrs 4 (6) 11 (17) 0.13 (0.03-0.70)
   Missing 0 (0) 3 (4) -
p-trend <0.001
Gender:    
   Male 37 (51) 18 (27) 1.00
   Female 35 (49) 48 (73) 0.35 (0.17-0.72)
Child cohabitant:    
   No 40 (56) 54 (82) 1.00
   Yes 31 (43) 12 (18) 3.48 (1.60-7.60)
   Missing 1 (1) 0 (0) -
IMD score:    
   Min-14 (least deprived) 6 (8) 2 (3) 1.00
   15-29 18 (25) 15 (23) 0.40 (0.07-2.28)
   30-44 36 (50) 26 (40) 0.46 (0.09-2.47)
   45-max (most deprived) 8 (11) 14 (21) 0.19 (0.03-1.18)
   Missing 4 (6) 9 (14) -
p-trend = 0.041
Flu Vaccine 08/09:    
   No 55 (76) 34 (52) 1.00
   Yes 17 (24) 30 (45) 0.35 (0.17-0.73)
   Missing 0 (0) 2 (3) -
Smoking status:    
   Non-smokers 38 (58) 47 (65) 1.00
   Current smokers 28 (42) 25 (35) 0.72 (0.36-1.44)
Co-morbidity:    
   No 56 (78) 41 (62) 1.00
   Yes 16 (22) 25 (38) 0.47 (0.22-0.99)
Frequency of habitual bus/tram use:    
   <once a week 40 (56) 24 (36) 1.00
   1-3 times a week 9 (13) 22 (33) 0.27 (0.11-0.69)
   >3 times a week 18 (25) 18 (27) 0.68 (0.29-1.57)
   Missing 5 (7) 2 (3) -
p-trend = 0.196
Use of bus/tram in previous 5 days:    
   No 34 (47) 31 (47) 1.00
   Yes 38 (53) 31 (47) 1.10 (0.55-2.21)
   Missing 0 (0) 4 (6) -
  1. Statistically significant results in bold