Socio-economic and age variations in response to supermarket-led checkout food policies: a repeated measures analysis

Table 1 Characteristics of included supermarkets

Supermarket	Checkout food policy		Annual market share 2013–17, median [bottom quartile; top quartil]	Annual purchases of common checkout foods (1000s) 2013–17, median [bottom quartile; top quartile]	Shopper mean social grade (5 = most affluent)	Shopper mean age (years)
Supermarket	Category	Implementation, month year			Shopper mean social grade (5 = most affluent)	Shopper mean age (years)
1	Clear and consistent	Jan 2014	3.9 [3.5;4.3]	60,179 [57,076;69,738]	3.43	52.6
2	Clear and consistent	Jan 2015	28.4 [28.0;28.9]	365,001 [357,128;384,010]	3.48	51.4
3	Clear and consistent	Jan 2015	5.4 [4.6;6.0]	65,961 [62,470;67,277]	3.45	49.7
4	Vague or inconsistent	Aug 2014	5.0 [4.8;5.0]	42,994 [39,928;43,912]	3.98	55.9
5	Vague or inconsistent	Sep 2015	3.1^a	34,659 [33,192;37,160]	3.71	58.6
6	Vague or inconsistent	Feb 2016	10.9 [10.3;11.1]	140,404 [131,333;140,866]	3.34	53.8
7	Vague or inconsistent	Unknown 2011	16.7 [15.0;17.2]	210,675 [186,455;212,429]	3.25	50.5
8a	Vague or inconsistent	Unknown 2004	15.7 [15.5;15.8]	142,153 [134,036;145,138]	3.64	53.5
8b	Absent	NA	0.8^a	25,459 [21,338;25,668]	3.64	53.5
9	Absent	NA	6.2 [6.1;6.2]	134,700 [122,584;142,182]	3.32	55.4

^aMarket share estimated from 2017 annual reports throughout, so no variation present

ISSN: 1479-5868