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Table 1 Characteristics of included supermarkets

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

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)
Category Implementation, month year
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 3.1a 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 0.8a 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
  1. aMarket share estimated from 2017 annual reports throughout, so no variation present