Table 3.
Predictors of fever in cases with viral respiratory infections
| Variable | Cases with fever (n/N) | Rate (%) | Univariate analysis (RR, 95% CI) | Multivariate analysis (RR, 95% CI) |
|---|---|---|---|---|
| Country | ||||
| China (trials 1 and 2) | 15/90 | 16·7 | Ref. | Ref. |
| Vietnam (trial 3) | 22/68 | 32·4 | 2·39 (1·13–5·07) | 2·99 (1·24–7·20) |
| Profession | ||||
| Doctors | 12/56 | 21·4 | 0·84 (0·38–1·84) | |
| Nurses | 25/102 | 24·5 | Ref. | |
| Age | 0·96 (0·92–1·01) | |||
| Gender | ||||
| Male | 9/21 | 42·9 | 2·92 (1·12–7·62) | |
| Female | 28/137 | 20·4 | Ref. | |
| Smoking status | ||||
| Current/ex-smoker | 7/12 | 58·3 | 5·41 (1·60–18·26) | 4·65 (1·33–16·25) |
| No | 30/146 | 20·5 | Ref. | Ref. |
| Influenza vaccine | ||||
| Yes | 6/22 | 27·3 | 1·27 (0·46–3·52) | |
| No | 31/136 | 22·8 | Ref. | |
| Type of virus | ||||
| Influenza virus | 3/13 | 23·1 | 1·09 (0·28–4·24) | 1·89 (0·43–8·31) |
| All other viruses* | 28/130 | 21·5 | Ref. | Ref. |
| Co-infection | 6/15 | 40 | 2·43 (0·80–7·40) | 4·19 (1·21–14·52) |
RR, Relative risk; CI, confidence interval.
* Includes human rhinovirus (n = 75), respiratory syncytial virus (n = 28), parainfluenza virus (n = 12), human metapneumovirus (n = 7), coronavirus (n = 7) and adenovirus (n = 1).