Covariates in the generalised additive models
| Covariates | Description |
|---|---|
| Tobacco control score | Categorical term for tobacco control score for England. 4 categories: 24.5, 27, 48 and 51 |
| Cigarette costliness | Weighted average price of packet of 20 cigarettes in month of interview divided by average monthly gross income of respondent (ie, proportion of monthly income that a packet of cigarettes costs). Include as cubic regression spline |
| Number of adults in the household | Number of adults in households of OS respondent. Include as linear term |
| Age | Age of OS respondent. Include as cubic regression spline |
| Gender | Categorical term for gender of OS respondent |
| Government office region | Categorical term for government office region of residence of OS respondent. 9 categories: East Midlands, East of England, London, North East England, North West England, South East England, South West England, West Midlands and Yorkshire & the Humber |
| Social class | Categorical term for national statistics socioeconomic classification (NS-SEC) of OS respondent. 4 categories: managerial and professional occupations, intermediate occupations, routine and manual occupations, not classified |
| Employment | Categorical term for employment status of OS respondent. 3 categories: employed, unemployed, economically inactive |
| Education | Categorical term for highest level of qualification that OS respondent has received. 8 categories: degree level qualification (or equivalent), Higher educational qualification below degree level, A-Levels or Highers, ONC/National Level BTEC, O Level or GCSE equivalent (Grade A–C) or O Grade/CSE equivalent (Grade 1) or Standard Grade level 1–3, GCSE grade D-G or CSE grade 2–5 or Standard Grade level 4–6, Other qualifications (including foreign qualifications below degree level), No formal qualifications |
| Income | Total gross income from all sources before deductions for income tax, National Insurance etc. Include as a cubic regression spline |
OS, Opinions and Lifestyle Survey.