Table 1. Socioeconomic status indicators and category definitions.
| SES indicator | Level | Description |
|---|---|---|
| Townsend Deprivation Score (area-level) | Fifth 1 | <−2.938 (least deprived) |
| Fifth 2 | 2.938 to <−1.531 | |
| Fifth 3 | −1.531 to <0.170 | |
| Fifth 4 | 0.170 to <2.448 | |
| Fifth 5 | ≥2.448 (most deprived) | |
| Household income (household-level), £/year | Group 1 | > 100 000 (highest household income) |
| Group 2 | 52 000 to 100 000 | |
| Group 3 | 31 000 to 51 999 | |
| Group 4 | 18 000 to 30 999 | |
| Group 5 | <18 000 (lowest household income) | |
| Educational attainment | Group 1 | College or University degree (highest educational attainment) |
| Group 2 | Education to ≥18 years (A levels/AS levels; NVQ/HND/HNC or equivalent; other professional qualifications) | |
| Group 3 | Education to ≥16 years (O levels/GCSEs/CSEs or equivalent) | |
| Group 4 | No qualifications (lowest educational attainment) |
CSEs, Certificate of Secondary Education; GCSEs, General Certificate of Secondary Education; HNC, Higher National Certificate; HND, Higher National Diploma; O levels, General Certificate of Education Ordinary Levels; A levels, General Certificate of Education Advanced Level; AS levels, General Certificate of Advanced Subsidiary Levels; NVQ, National Vocational Qualification; SES, socioeconomic status.