Table 1 Categorisation of socioeconomic variables.
Socioeconomic variable | Categorisation | Comparison |
|---|---|---|
Social Class | Registrar General's Social Class coded 1–6 for classes I-V respectively. All other values considered missing in models of social class as only s/e variable (column 1 of Table 2) and as a separate "other" category in other models. | Rate ratio per unit change in 6-point scale (professional to unskilled). |
Carstairs quintiles | Carstairs index for wards of E&W. All residents of ward assigned quintile based on ward ranking. | Rate ratio per unit change in 5-point scale (less to more disadvantage). |
Car Access | Access to car or van by household. | No car access vs any access. |
Housing Tenure | Owner-occupation or rented accommodation | Rent vs own/occ. |