Table 4. Incidence rate ratio of increased purchases of alcohol (95% confidence intervals) by household characteristics.

	Incidence rate ratio by household characteristics
Purchase group
>70	17.25 (14.75 to 20.19)
>28–70	11.38 (9.70 to 13.34)
>14–28	5.96 (5.06 to 7.03)
>7–14	4.80 (4.06 to 5.68)
0–7 (reference category)	1.00 (0. to 0.)
Age group
25–44	0.79 (0.75 to 0.84)
45–64	0.67 (0.63 to 0.71)
65+ (reference category)	1.00 (0. to 0.)
Social grade
E	1.59 (1.51 to 1.68)
D	0.79 (0.74 to 0.85)
C2	1.06 (1.00 to 1.12)
C1	1.07 (1.01 to 1.13)
AB (reference category)	1.00 (0. to 0.)
Household income
£0–7.5k	0.92 (0.87 to 0.98)
>£7.5–12.5k	0.63 (0.59 to 0.67)
>£12.5–15.5k	0.73 (0.69 to 0.78)
>£17.5 to 25k	0.64 (0.60 to 0.68)
>£25k (reference category)	1.00 (0. to 0.)
Area-based Deprivation group
1 (most deprived)	1.13 (1.06 to 1.19)
2	0.99 (0.94 to 1.05)
3	0.81 (0.76 to 0.86)
4	1.05 (0.99 to 1.11)
5 (least deprived) (reference category)	1.00 (0. to 0.)
Region
Scotland	0.53 (0.49 to 0.57)
Wales	0.48 (0.44 to 0.51)
North East	1.37 (1.30 to 1.45)
North West	0.79 (0.74 to 0.84)
Yorkshire and The Humber	1.72 (1.63 to 1.81)
East Midlands	1.09 (1.03 to 1.15)
West Midlands	1.01 (0.95 to 1.07)
Eastern	1.06 (1.00 to 1.12)
London	0.92 (0.87 to 0.98)
South East	0.90 (0.85 to 0.96)
South West (reference category)	1.00 (0. to 0.)