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Table 1 Food store classifications and the ratio and proportion values in three example neighbourhoods

From: The use and misuse of ratio and proportion exposure measures in food environment research

 

Unhealthy food stores

Healthy food stores

Ratio (unhealthy: healthy)

Proportion (healthy: all food stores)

Area 1

1 x chain fast food restaurant

2 x greengrocer (fruit and vegetable store)

0.5

0.66

Area 2

1 x small takeaway food store (e.g. independent pizzeria)

1 x mid-size supermarket (grocery store)

1

0.5

Area 3

1 x chain fast food restaurant

2 x convenience stores

2 x small takeaway food stores

1 x large supermarket

1 x fruit and vegetable market

1 x ethnic grocery store

1.67

0.375