Table 2.
Risk factors for carriage of Neisseria meningitidis during first week of term
| Exposure | Odds ratio (95% CI) | P value |
|---|---|---|
| Day of throat swab | ||
| Tuesday | Reference | |
| Wednesday | 1.74 (1.2 to 2.5) | 0.003 |
| Thursday | 2.99 (2.1 to 4.2) | 0.0001 |
| Friday | 4.05 (2.7 to 6.1) | 0.0001 |
| Type of hall | ||
| Mixed sex | Reference | |
| Male only | 1.16 (0.8 to 1.6) | 0.3 |
| Female only | 0.77 (0.5 to 1.3) | 0.4 |
| Off campus | 0.64 (0.5 to 0.9) | 0.01 |
| Passive smoking (days) | ||
| 0-2 | Reference | |
| 3-4 | 1.26 (0.8 to 1.9) | 0.3 |
| 5-6 | 1.60 (1.1 to 2.4) | 0.2 |
| 7 | 2.03 (1.3 to 3.1) | 0.001 |
| Smoker | 2.40 (1.6 to 3.7) | 0.0001 |
| No of people kissed | ||
| 0 | Reference | |
| 1 | 1.41 (1.1 to 1.8) | 0.01 |
| ⩾2 | 1.19 (0.7 to 2.0) | 0.5 |
Each risk adjusted for all other variables in table and antibiotic use in previous month.