Table 2.
Univariable and multivariable linear regression of association between index case variables and log10 viral load
| Log10viral load per mL | Unadjusted β coefficient (95% CI) | p value | Adjusted β coefficient (95% CI) | p value | |||
|---|---|---|---|---|---|---|---|
| Case age | NA | 0·00 (−0·02 to 0·02) | 0·78 | 0·01 (−0·01 to 0·02) | 0·38 | ||
| Case sex | |||||||
| Men | 8·15 (7·54 to 8·77) | Reference | .. | Reference | .. | ||
| Women | 8·04 (7·47 to 8·60) | −0·24 (−0·72 to 2·40) | 0·33 | −0·22 (−0·61 to 0·34) | 0·59 | ||
| Days from symptom onset | NA | −0·17 (−0·26 to 0·08) | 0·0002 | −0·16 (−0·24 to 0·07) | 0·0004 | ||
| Symptoms | |||||||
| Cough | |||||||
| Absent | 7·82 (7·24 to 8·41) | Reference | .. | Reference | .. | ||
| Present | 8·37 (7·78 to 8·95) | 0·66 (0·22 to 1·10) | 0·0032 | 0·41 (−0·02 to 0·84) | 0·055 | ||
| Dyspnoea | |||||||
| Absent | 7·97 (7·50 to 8·43) | Reference | .. | Reference | .. | ||
| Present | 8·22 (7·45 to 8·99) | 0·27 (−0·40 to 0·94) | 0·42 | 0·28 (−0·35 to 0·92) | 0·38 | ||
| Fever | |||||||
| Absent | 7·77 (7·16 to 8·38) | Reference | .. | Reference | .. | ||
| Present | 8·42 (7·86 to 8·98) | 0·80 (0·36 to 1·24) | 0·0004 | 0·43 (0·00 to 0·87) | 0·054 | ||
| Anosmia | |||||||
| Absent | 8·32 (7·76 to 8·88) | Reference | .. | Reference | .. | ||
| Present | 7·87 (7·25 to 8·49) | −0·57 (−1·00 to −0·09) | 0·019 | −0·54 (−1·00 to 0·09) | 0·019 | ||
| Rhinitis | |||||||
| Absent | 7·60 (7·23 to 7·98) | Reference | .. | Reference | .. | ||
| Present | 8·59 (7·65 to 9·52) | 0·88 (−0·05 to 1·82) | 0·064 | 0·77 (−0·11 to 1·66) | 0·087 | ||
NA=not applicable.