Table 1.

Demographic characteristics of study sample

	All households	Low-income	Mid-income	High-income
Number of HH’s	31 919	11 422	15 680	4817
Number of observations	575 965	198 464	287 966	89 535
Household size	2.7 (1.3)	2.3 (1.3)	2.9 (1.3)	3.2 (1.2)
Age of main shopper	47.8 (15.3)	52.4 (17.0)	46.0 (14.3)	42.9 (10.7)
Number of children if have children	1.7 (0.8)	1.8 (0.87)	1.8 (0.86)	1.7 (0.75)
Share of households that have children	0.38	0.29	0.42	0.5
Social class	% of households
Class A&B (highly skilled)	20.2	5.7	20.9	52.6
Class C1	37.6	30.6	43.1	36.3
Class C2	18.0	15.7	22.4	9.2
Class D	13.9	22.0	11.7	1.7
Class E (unskilled)	10.3	26.1	1.9	0.3
Highest qualification	% of households
Degree or higher	24.2	11.64	25.99	48.02
Higher education	13.5	11.65	15.33	12.14
A Level	11.7	9.96	13.25	10.61
GCSE	18.9	22.38	18.93	10.8
Other	7.6	11.64	6.05	3.13
None	7.6	15.25	4.06	0.93
Unknown	16.5	17.48	16.4	14.37
Tenure	% of households
Owned outright	24.31	29.66	22.91	16.21
Mortgaged	40.09	17.19	47.64	69.82
Rented	29.64	46.42	23.54	9.72
Other	1.46	1.8	1.39	0.79
Unknown	4.5	4.89	4.52	3.47

Low income <£20 000 per year; mid-income £20 000 – £49 000; high-income >£50 000+.