Table 2.
Predictors of the number of secondary cases in the household, offset against the number of potentially exposed household members (participant primay case, 177 household ILI events)
| Explanatory variable | SHAP for group (# episodes) |
Multivariate Poisson regression |
||
|---|---|---|---|---|
| IRR (95% CI) | p | |||
| Virus Group (cf none detected) |
None |
0.129 (95) |
1.00 (def) |
- |
| Picornavirus |
0.143 (40) |
0.937 (0.475, 1.85) |
0.851 |
|
| Influenza |
0.238 (17) |
2.11 (0.992, 4.49) |
0.052 |
|
| Coronavirus |
0.357 (6) |
1.80 (0.670, 4.85) |
0.243 |
|
| Other |
0.000 (8) |
- |
- |
|
| Sex (cf male) |
Male |
0.085 (69) |
1.00 (def) |
- |
| Female |
0.172 (108) |
2.12 (1.10, 4.09) |
0.025 |
|
| Smoking (cf not current smoker) |
Not current smoker |
0.136 (161) |
1.00 (def) |
- |
| Current smoker |
0.250 (12) |
1.91 (0.738, 4.94) |
0.183 |
|
| Age (cf 18–24 years) |
18-24 years |
0.106 (47) |
Not included |
- |
| 25-34 years |
0.115 (28) |
Not included |
- |
|
| 35-44 years |
0.235 (37) |
Not included |
- |
|
| 45-54 years |
0.095 (36) |
Not included |
- |
|
| 55-64 years |
0.100 (29) |
Not included |
- |
|
| Household size (cf size 2) |
2 |
0.219 (64) |
Not included |
- |
| 3 |
0.068 (44) |
Not included |
- |
|
| 4 |
0.123 (46) |
Not included |
- |
|
| 5 |
0.206 (17) |
Not included |
- |
|
| 6 |
0.200 (3) |
Not included |
- |
|
| 7 |
0.000 (3) |
Not included |
- |
|
| Presence of child (cf no children in house) | No children in house |
0.118 (123) |
1.00 (def) |
- |
| At least one child in house | 0.167 (54) | 1.51 (0.864, 2.65) | 0.147 | |