HRs for any COVID-19 for adults living in healthcare worker households by number of persons of different ages
| Per child aged 0–4 years | Per child aged 5–11 years | Per child aged 12–17 years | Per adult aged 18 years or above | |
| Unadjusted | 0.88 (0.81–0.96) | 1.07 (1.01–1.13) | 0.87 (0.84–0.89) | 0.97 (0.91–1.02) |
| Model 1 | 0.87 (0.80–0.95) | 1.03 (0.97–1.09) | 0.88 (0.85–0.90) | 0.94 (0.88–0.99) |
| Model 2 | 0.86 (0.78–0.94) | 1.05 (0.99–1.12) | 1.04 (1.02–1.07) | 0.95 (0.89–1.01) |
| Model 3 | 0.86 (0.78–0.94) | 1.05 (0.99–1.12) | 1.04 (1.02–1.07) | 0.95 (0.89–1.01) |
| Model 4 | 0.87 (0.80–0.95) | 1.06 (1.00–1.12) | 1.04 (1.01–1.07) | 0.96 (0.90–1.02) |
Model specification and covariates as per footnote of table 2. The unadjusted models and model 1 were fitted separately for each exposure (eg, aged 0–5 years and aged 6–11 years), but all exposures were included in models 2, 3 and 4. The effect estimates corresponds to ‘per child’ column in tables 2–3, where the counts of children and adults were treated as continuous variables, which assumes that any association between the number of children (or adults) and the hazard rate is log-linear.