Table 5
 Effect of working in a coffeehouse on airway disease stratified by smoking
Smoker
Non-smoker
Airway disease
Normal
Airway disease
Normal
Coffeehouse
42
59
2
11
Other
11
65
0
17
Total
53
124
2
28
OR (95% CI)
4.21 (1.88 to 9.59)
3.09 (0.18 to 98.64)
Crude OR (95% CI)
4.69 (2.14 to 10.46)
M-H OR (95% CI)
4.52 (2.04 to 10.20)