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Table 3 Positive predictive value (95% CI) and proportion of food outlets classified automatically across food outlet classification and definition

From: Validation of retail food outlet data from a Danish government inspection database

Food outlet classification

Definition

True positives a

False positives

PPV (95% CI)

% classified from the systematic name-based procedure

Restaurant

Narrow

184

118

0.61 (0.55–0.66)

28

Moderate

302

147

0.67 (0.63–0.72)

37

Broad

402

138

0.74 (0.71–0.78)

45

Fast food

Narrow

13

6

0.68 (0.48–0.89)

68

Moderate

400

30

0.93 (0.91–0.95)

59

Broad

528

44

0.92 (0.90–0.95)

61

Convenience store

Narrow

71

12

0.86 (0.78–0.93)

63

Moderate

108

14

0.89 (0.83–0.94)

72

Broad

111

14

0.89 (0.83–0.94)

73

Supermarket

Narrow

48

9

0.84 (0.75–0.94)

84

Moderate

167

5

0.97 (0.95–1.00)

96

Broad

280

17

0.94 (0.92–0.97)

87

Fruit and Vegetables

17

22

0.44 (0.28–0.59)

Miscellaneous

108

5

0.96 (0.92–0.99)

81

  1. CI Confidence interval, PPV Positive predictive value a Number of food outlets correctly located (1831) and number of outlets wrongly classified (443) but found to be in the correct location