Table 2.
Association between outbreak characteristics and norovirus detection, care home gastroenteritis outbreaks of a confirmed viral cause (n = 257), North East England, 2016–2018
| Variable | Other viruses (n = 76) | Norovirus (n = 181) | OR | p value | aOR | 95% Confidence Interval | p value | |||
|---|---|---|---|---|---|---|---|---|---|---|
| Mean | SD | Mean | SD | |||||||
| Resident attack rate | 33.04 | 19.27 | 38.30 | 17.74 | 1.02 | 0.038 | 1.03 | 1.01 | 1.05 | 0.004 |
| Number of residents | 44.75 | 19.58 | 45.73 | 16.41 | 1.00 | 0.679 | 1.02 | 0.99 | 1.04 | 0.077 |
| Outbreak duration | 20.84 | 10.41 | 18.87 | 10.60 | 0.98 | 0.174 | 0.98 | 0.95 | 1.01 | 0.130 |
| Number of cases sampled | 3.66 | 2.33 | 3.17 | 1.83 | 0.89 | 0.080 | 0.74 | 0.60 | 0.91 | 0.005 |
| Number of virus-positive samples | 2.46 | 1.71 | 2.53 | 1.55 | 1.03 | 0.749 | 1.25 | 0.97 | 1.62 | 0.091 |
| Outbreak in winter? (number and percentage | 48 | 63.20 | 129 | 71.30 | 1.45 | 0.201 | . | . | . | . |
| Ratio of staff to residents | 1.21 | 0.38 | 1.21 | 0.40 | 1.02 | 0.965 | 1.17 | 0.53 | 2.57 | 0.701 |