Unadjusted risk ratios and adjusted risk ratios from mixed effects Poisson regression models (allowing for practice-level clustering) by the key risk factors (n=57 545)*
| Variable | Unadjusted risk ratio | Adjusted risk ratio (ARR)† |
|---|---|---|
| Age (years) | ||
| 2 | 1 | 1 |
| 3 | 1.04 (1.01 to 1.08) | 1.04 (1.01 to 1.07) |
| 4 | 0.78 (0.76 to 0.81) | 0.79 (0.76 to 0.82) |
| In clinical risk group | ||
| No | 1 | 1 |
| Yes | 1.44 (1.37 to 1.51) | 1.45 (1.38 to 1.53) |
| Number of other children in household | ||
| 0 | 1 | 1 |
| 1 | 0.98 (0.95 to 1.01) | 0.99 (0.96 to 1.02) |
| 2 | 0.86 (0.82 to 0.89) | 0.90 (0.86 to 0.94) |
| 3 | 0.77 (0.72 to 0.82) | 0.82 (0.77 to 0.88) |
| 4 | 0.67 (0.59 to 0.76) | 0.74 (0.65 to 0.84) |
| 5 | 0.60 (0.47 to 0.76) | 0.68 (0.53 to 0.86) |
| Townsend quintile | ||
| 1st (least deprived) | 1 | 1 |
| 2nd | 0.95 (0.91 to 0.98) | 0.95 (0.91 to 0.98) |
| 3rd | 0.90 (0.86 to 0.93) | 0.90 (0.87 to 0.94) |
| 4th | 0.84 (0.81 to 0.88) | 0.86 (0.82 to 0.89) |
| 5th (most deprived) | 0.79 (0.75 to 0.83) | 0.81 (0.77 to 0.86) |
| Timely first dose MMR vaccine | ||
| No | 1 | 1 |
| Yes | 2.08 (1.95 to 2.22) | 2.00 (1.87 to 2.13) |
| Country* | ||
| England | 1 | − |
| Wales | 1.02 (0.88 to 1.17) | |
| Sex* | ||
| Male | 1 | − |
| Female | 0.99 (0.96 to 1.01) | |
| Rurality* | ||
| Urban | 1 | − |
| Town/fringe | 1.05 (0.98 to 1.13) | |
| Village/hamlet/isolated dwelling | 1.02 (0.94 to 1.10) | |
*Country, sex and rurality were not included in the final model.
†Results from final model. ARRs are adjusted for all other variables in the model. AIC: 82820.8.
MMR measles-mumps-rubella.