Adjusted relative risk of invasive meningococcal disease in children and adults (all ages included) according to annual percentage of daily smokers in different genders and age groups in Sweden between 1980 and 2007, after adjustment for year and household crowding
| Age group (years) | Gender | Relative risk of IMD associated with a 1% increase in prevalence of smoking (95% CI) | p Value |
|---|---|---|---|
| 16–24 | M | 0.93 (0.90 to 0.95) | <0.001* |
| F | 0.94 (0.91 to 0.96) | <0.001* | |
| 25–34 | M | 0.97 (0.95 to 0.99) | 0.002* |
| F | 1.05 (1.01 to 1.08) | 0.005* | |
| 35–44 | M | 1.11 (1.07 to 1.15) | <0.001* |
| F | 1.07 (1.04 to 1.10) | <0.001* | |
| 45–54 | M | 1.04 (1.00 to 1.08) | 0.043* |
| F | 1.06 (1.04 to 1.09) | <0.001* | |
| 55–64 | M | 0.95 (0.93 to 0.98) | 0.004* |
| F | 1.01 (0.98 to 1.04) | 0.376 |
*Statistically significant (p<0.05) association between prevalence of smoking and incidence of IMD
IMD, invasive meningococcal disease; F, female; M, male.