Table 3.
Attack rates (AR) and relative risks for persons with serologically confirmed influenza infection (SCII) as outcome, by exposure (n = 736), sorted by p-value
| Exposed | Unexposed | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Exposure | SCII | Total | AR% | SCII | Total | AR% | Relative risk | 95% confidence interval | P-value |
| Household car ownership | 66 | 551 | 12.0 | 10 | 176 | 6 | 2.11 | 1.11-4.01 | 0.02 |
| Immunisation in current season | 18 | 257 | 7.0 | 60 | 479 | 13 | 0.56 | 0.34-0.93 | 0.02 |
| Household contacts | |||||||||
| Lives alone | 3 | 75 | 4.0 | - | - | - | Ref | - | - |
| Lives with adults | 43 | 430 | 10.0 | - | - | - | 2.50 | 0.80-7.85 | 0.13 |
| 1 or 2 children | 24 | 198 | 12.1 | - | - | - | 3.03 | 0.94-9.77 | 0.07 |
| 3 or more children | 8 | 33 | 24.2 | - | - | - | 6.06 | 1.72-21.41 | <0.01 |
| 7 or more daily child patient contacts | 8 | 45 | 17.8 | 70 | 691 | 10.13 | 1.75 | 0.90-3.42 | 0.11 |
| Doctor | 7 | 39 | 18.0 | 71 | 697 | 10.19 | 1.76 | 0.87-3.57 | 0.13 |
| Being employed | 70 | 685 | 10.2 | 8 | 51 | 15.69 | 0.65 | 0.33-1.28 | 0.22 |
| Current smoker (at recruitment) | 28 | 224 | 12.5 | 50 | 502 | 9.96 | 1.25 | 0.81-1.94 | 0.31 |
| Male sex | 25 | 217 | 11.5 | 53 | 519 | 10.21 | 1.13 | 0.72-1.77 | 0.60 |
| Working 30+ hours per week | 60 | 581 | 10.3 | 18 | 155 | 11.61 | 0.89 | 0.54-1.46 | 0.64 |
| Healthcare worker | 28 | 250 | 11.2 | 50 | 486 | 10.29 | 1.09 | 0.70-1.68 | 0.70 |
| Regular public transport use | 47 | 431 | 10.9 | 31 | 302 | 10.26 | 1.06 | 0.69-1.63 | 0.78 |
| Nurse (qualified or trainee) | 20 | 206 | 9.7 | 50 | 486 | 10.29 | 0.94 | 0.58-1.54 | 0.82 |
| Age 16-24 years | 18 | 177 | 10.2 | 60 | 559 | 10.7 | 0.95 | 0.57-1.56 | 0.83 |
| Age 25-49 years | 44 | 392 | 11.2 | 34 | 344 | 9.9 | 1.14 | 0.74-1.73 | 0.56 |
| Age 50+ years | 16 | 167 | 9.6 | 62 | 569 | 10.9 | 0.88 | 0.52-1.48 | 0.78 |