Descriptive statistics for sample households at first observation (N=3024)
| Variable | Sample mean |
| Age of main shopper | 45.0 (13.8) (18–85) |
| Age of main shopper2/100 | 22.1 (13.3) (3.2–72.3) |
| Household size | 2.8 (1.3) (1–9) |
| One or more children in household | 40.1% |
| Low annual household income <£20 000 | 38.3% |
| Middle annual household income >£19 999 and <£40 000 | 40.0% |
| High annual household income >£39 999 | 21.7% |
SD in parentheses and range in brackets for continuous variables only.