Risk factors for SARS-CoV-2 household transmission: multivariable analysis
| Risk factor | Adjusted OR | 95% CI | P value |
| Primary case has diarrhoea | – | – | – |
| No | – | – | Ref |
| Yes | 4.10 | (1.08 to 15.60) | 0.04 |
| Close contact at home with primary cases (within 1 m or 3 feet) (times) | – | – | – |
| 0 | – | – | Ref |
| 1–3 | 3.30 | (1.05 to 10.40) | 0.04 |
| ≥4 | 18.26 | (3.93 to 84.79) | ＜0.001 |
| No of family members (including primary case) wearing a mask at home before the primary case’s illness onset date | – | – | – |
| None | – | – | Ref |
| 1 or more | 0.21 | (0.06 to 0.79) | 0.02 |
| Frequency of chlorine or ethanol based disinfectant use for house cleaning | – | – | – |
| Once in 2 or more days | – | – | Ref |
| Once a day or more | 0.23 | (0.07 to 0.84) | 0.03 |