Table 3.
Relation between cigarette smoke exposure and invasive pneumococcal disease
| Smoke exposure category | Cases No. (%) | Controls No. (%) | Odds ratio (95% CI) |
|---|---|---|---|
| All subjects | |||
| Definitely not exposed or probably not exposed | 94 (55) | 191 (56) | Reference |
| Definitely exposed or probably exposed | 43 (25) | 103 (30) | 0.76 (0.47–1.23)a |
| No information in chart | 34 (20) | 48 (14) | — |
| Subjects classified as “definite” | |||
| Definitely not exposed | 35 (60) | 85 (63) | Reference |
| Definitely exposed | 23 (40) | 50 (37) | 0.97 (0.50–1.88)b |
a
Conditional logistic regression odds ratio adjusted for receipt of any pneumococcal vaccine and patterns of Health Plan membership. This analysis used 132 case-control sets with smoke exposure data on the case (n = 132, 30% exposed) and at least 1 of the 2 matched controls (n = 239, 35% exposed).
b
Unconditional logistic regression odds ratio adjusted for age, presence of family members in Health Plan, area of residence, receipt of any pneumococcal vaccine, and patterns of Health Plan membership.
CI = confidence interval.