Classification of stores

We used the Australia New Zealand Standard Industrial Store Classification (“The Australian and New Zealand Standard Industrial Classification (ANZSIC) 2006.,"), and methods employed in similar international studies (Connell et al., 2007; Han et al., 2012; Morland, Wing, Roux, & Poole, 2002; Stern, Ng, & Popkin, 2016), to develop store classification criteria. We identified the variety of fruit and vegetables purchased by NZ Nielsen Homescan® panellists from different stores over the one-year period. We applied the criteria in two steps and classified stores as supermarkets, grocery stores, convenience stores, fruit and vegetable stores, meat and fish stores, and bakeries. At the first step, the variety of fruit and vegetables purchased were used to classify supermarkets, grocery stores, and convenience stores. At the second step, criteria on the availability of fresh milk, breads, and fresh meats were applied (Table 1). Meat products, including fish, seafood and poultry products, and bakery products were defined according to the Nutritrack food classification system which is based on the Global Food Monitoring Food Classification (Webster, Dunford, & Neal, 2010).

Criteria and classification of stores, using Nielsen NZ Homescan® panel data, Oct 2018–Oct 2019.