Table 1

Characteristics of cases and controls (n = 138)

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)

-


Statistically significant results in bold

Troko et al. BMC Infectious Diseases 2011 11:16   doi:10.1186/1471-2334-11-16

Open Data