Table 3.
Univariate regression analyses on different covariates in relation to the risk of laboratory-confirmed influenza in combined countries' data and developed countries' data (hand hygiene intervention only)
| Laboratory-confirmed influenza (combined data – hand hygiene intervention only) | ||||||
|---|---|---|---|---|---|---|
| Covariates | Combined data (six studies) | Developed countries only (four studies) | ||||
| RRR | 95% CI | P value | RRR | 95% CI | P value | |
| Latitude (10° change) | 1·00 | 0·66–1·54 | 0·984 | 1·28 | 0·91–1·79 | 0·145 |
| Average temperature (10°C change) | 0·93 | 0·59–1·49 | 0·778 | 0·82 | 0·59–1·13 | 0·221 |
| Average relative humidity (10 percentage point change) | 1·20 | 0·89–1·63 | 0·227 | 0·63 | 0·32–1·22 | 0·169 |
RRR, Relative risk ratio; CI, confidence interval.