Product barcode details were used to match products between Nutritrack and Nielsen NZ Homescan®. For products that could not be matched in this way, the following four-step approach was used.

Fig. 1 illustrates 31,470 unique products, of which 23,020 (23,020/31,470 = 73.1%) products were eligible for inclusion after the first exclusion step. Following the second exclusion step, 89.0% of all eligible products (20,491/23,020 = 89.0%) were matched to food composition data and included in our analyses. In the second exclusion step, 11% (2525/23,020) were uncommon products, and 4 products were purchased from a retail brand only in one location for the one-year period; therefore, these products were excluded.

Flow diagram showing number of products included in the study.

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