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Table 7 Mean food outlet count, Positive Predictive Value and Sensitivity of different RDFE

From: Exploring factors affecting individual GPS-based activity space and how researcher-defined food environments represent activity space, exposure and use of food outlets

RDFE

Food outlet type

TP

FN

FP

Total Food outlet

PPV

95% CI

Sens

95%CI

Type

Size

AS

RDFE

Circular Buffer around Home

2 km

Convenience store

48

183

10

231

58

0.83

[0.78, 0.88]

0.29

[0.23, 0.36]

 

Fast-food outlet

62

237

12

299

74

0.86

[0.82, 0.90]

0.28

[0.21, 0.35]

 

Other

91

530

12

621

103

0.87

[0.81, 0.91]

0.23

[0.16, 0.30]

 

Supermarket

6

21

2

27

8

0.75

[0.66, 0.83]

0.32

[0.25, 0.39]

4 km

Convenience store

111

120

96

231

207

0.55

[0.49, 0.61]

0.57

[0.49, 0.64]

 

Fast-food outlet

144

155

111

299

255

0.58

[0.52, 0.64]

0.55

[0.47, 0.63]

 

Other

274

347

167

621

441

0.62

[0.55, 0.68]

0.51

[0.42, 0.60]

 

Supermarket

14

13

13

27

27

0.53

[0.46, 0.60]

0.57

[0.49, 0.66]

6 km

Convenience store

156

75

231

231

387

0.4

[0.36, 0.46]

0.75

[0.68, 0.82]

 

Fast-food outlet

205

94

257

299

462

0.45

[0.40, 0.50]

0.74

[0.67, 0.82]

 

Other

427

194

391

621

818

0.5

[0.44, 0.57]

0.73

[0.65, 0.81]

 

Supermarket

18

9

29

27

47

0.4

[0.35, 0.45]

0.74

[0.66, 0.81]

Circular Buffer around Workplace

2 km

Convenience store

61

170

18

231

79

0.72

[0.67, 0.77]

0.31

[0.25, 0.37]

 

Fast-food outlet

91

208

20

299

111

0.78

[0.73, 0.82]

0.35

[0.29, 0.41]

 

Other

231

390

25

621

256

0.79

[0.74, 0.85]

0.4

[0.32, 0.49]

 

Supermarket

6

21

2

27

8

0.7

[0.62, 0.77]

0.31

[0.25, 0.37]

4 km

Convenience store

126

105

150

231

276

0.44

[0.39, 0.49]

0.61

[0.54, 0.68]

 

Fast-food outlet

177

122

183

299

360

0.48

[0.42, 0.53]

0.63

[0.56, 0.70]

 

Other

376

245

222

621

598

0.55

[0.48, 0.61]

0.62

[0.54, 0.70]

 

Supermarket

14

13

20

27

34

0.4

[0.35, 0.45]

0.59

[0.52, 0.65]

6 km

Convenience store

169

62

292

231

461

0.37

[0.32, 0.42]

0.79

[0.72, 0.85]

 

Fast-food outlet

228

71

334

299

562

0.41

[0.36, 0.46]

0.8

[0.74, 0.86]

 

Other

488

133

504

621

992

0.63

[0.56, 0.69]

0.8

[0.73, 0.87]

 

Supermarket

20

7

39

27

59

0.34

[0.30, 0.38]

0.79

[0.73, 0.86]

Circular Buffer around Home and Workplace

2 km

Convenience store

100

131

28

231

128

0.75

[0.71, 0.80]

0.5

[0.44, 0.56]

 

Fast-food outlet

138

161

31

299

169

0.78

[0.74, 0.83]

0.36

[0.32, 0.39]

 

Other

299

321

38

621

337

0.82

[0.77, 0.86]

0.52

[0.44, 0.60]

 

Supermarket

11

16

4

27

15

0.74

[0.69, 0.79]

0.5

[0.43, 0.57]

4 km

Convenience store

177

54

199

231

376

0.46

[0.41, 0.51]

0.82

[0.77, 0.86]

 

Fast-food outlet

236

63

230

299

466

0.48

[0.42, 0.53]

0.82

[0.77, 0.87]

 

Other

493

128

317

621

810

0.57

[0.51, 0.64]

0.81

[0.76, 0.87]

 

Supermarket

20

7

26

27

46

0.43

[0.38, 0.48]

0.79

[0.74, 0.85]

6 km

Convenience store

208

23

375

231

583

0.35

[0.31, 0.40]

0.93

[0.10, 0.96]

 

Fast-food outlet

276

23

417

299

693

0.4

[0.35, 0.44]

0.94

[0.92, 0.96]

 

Other

578

43

615

621

1193

0.48

[0.42, 0.55]

0.94

[0.92, 0.96]

 

Supermarket

24

3

62

27

86

0.33

[0.29, 0.37]

0.93

[0.90, 0.96]

Street-network buffer around home

2 km

Convenience store

31

200

2

231

33

0.94

[0.92, 0.97]

0.19

[0.14, 0.24]

 

Fast-food outlet

42

257

3

299

45

0.95

[0.92, 0.97]

0.19

[0.14, 0.25]

 

Other

58

563

3

621

61

0.95

[0.93, 0.98]

0.16

[0.09, 0.22]

 

Supermarket

4

23

0

27

4

0.79

[0.69, 0.89]

0.2

[0.16, 0.25]

4 km

Convenience store

86

145

45

231

131

0.68

[0.63, 0.74]

0.46

[0.38, 0.54]

 

Fast-food outlet

111

188

51

299

162

0.7

[0.64, 0.75]

0.44

[0.36, 0.52]

 

Other

204

417

61

621

265

0.73

[0.67, 0.78]

0.4

[0.31, 0.49]

 

Supermarket

11

16

7

27

18

0.61

[0.43, 0.55]

0.47

[0.39, 0.54]

6 km

Convenience store

135

96

149

231

284

0.53

[0.48, 0.59]

0.67

[0.59, 0.74]

 

Fast-food outlet

177

121

169

299

346

0.58

[0.51, 0.65]

0.66

[0.57, 0.74]

 

Other

364

257

260

621

624

0.58

[0.51, 0.65]

0.65

[0.55, 0.74]

 

Supermarket

16

11

29

27

45

0.48

[0.41, 0.54]

0.67

[0.59, 0.74]

Street-network buffer around workplace

2 km

Convenience store

39

192

6

231

45

0.89

[0.84, 0.94]

0.18

[0.14, 0.21]

 

Fast-food outlet

63

236

6

299

69

0.91

[0.86, 0.95]

0.24

[0.19, 0.28]

 

Other

177

444

7

621

184

0.93

[0.89, 0.96]

0.28

[0.21, 0.35]

 

Supermarket

3

24

1

27

4

0.9

[0.84, 0.97]

0.14

[0.11, 0.17]

4 km

Convenience store

103

128

86

231

189

0.53

[0.47, 0.59]

0.5

[0.43, 0.56]

 

Fast-food outlet

147

152

103

299

250

0.57

[0.52, 0.63]

0.53

[0.46, 0.60]

 

Other

329

292

123

621

452

0.65

[0.59, 0.71]

0.54

[0.46, 0.63]

 

Supermarket

11

16

11

27

22

0.51

[0.45, 0.56]

0.59

[0.51, 0.65]

6 km

Convenience store

153

78

208

231

361

0.41

[0.36, 0.46]

0.73

[0.66, 0.80]

 

Fast-food outlet

209

90

245

299

454

0.45

[0.40, 0.50]

0.74

[0.66, 0.80]

 

Other

457

164

391

621

848

0.51

[0.44, 0.59]

0.75

[0.68, 0.82]

 

Supermarket

17

10

28

27

45

0.38

[0.34, 0.42]

0.72

[0.65, 0.78]

Straight-line Buffer

2 km

Convenience store

133

98

47

231

180

0.72

[0.67, 0.77]

0.62

[0.55, 0.68]

 

Fast-food outlet

175

123

54

299

229

0.75

[0.70, 0.80]

0.63

[0.56, 0.70]

 

Other

368

253

68

621

436

0.8

[0.75, 0.85]

0.62

[0.54, 0.70]

 

Supermarket

15

12

6

27

21

0.71

[0.65, 0.77]

0.62

[0.56, 0.69]

4 km

Convenience store

190

41

224

231

414

0.45

[0.40, 0.49]

0.85

[0.80, 0.89]

 

Fast-food outlet

249

50

258

299

507

0.48

[0.43, 0.53]

0.85

[0.80, 0.89]

 

Other

517

104

355

621

872

0.56

[0.50, 0.63]

0.84

[0.78, 0.89]

 

Supermarket

21

6

30

27

51

0.41

[0.37, 0.46]

0.83

[0.78, 0.88]

6 km

Convenience store

215

16

388

231

603

0.35

[0.31, 0.39]

0.94

[0.92, 0.92]

 

Fast-food outlet

281

18

427

299

708

0.39

[0.35, 0.44]

0.95

[0.93, 0.97]

 

Other

589

31

626

621

1215

0.48

[0.42, 0.54]

0.95

[0.92, 0.97]

 

Supermarket

25

2

50

27

75

0.33

[0.29, 0.36]

0.94

[0.92, 0.97]

Standard Deviational Ellipse

 

Convenience store

153

78

140

231

293

0.6

[0.53, 0.67]

0.62

[0.54, 0.71]

 

Fast-food outlet

193

106

152

299

345

0.63

[0.56, 0.70]

0.62

[0.54, 0.71]

 

Other

384

237

216

621

600

0.67

[0.60, 0.75]

0.6

[0.51, 0.68]

 

Supermarket

18

9

17

27

35

0.6

[0.52, 0.68]

0.6

[0.52, 0.69]

  1. TP  True positive (food outlets in AS and RDFE), FN False Negative (food outlets in AS only); FP  False Positive (food outlets in RDFE only); PPV  Positive Predictive Value, Sens  Sensitivity, RDFE  Researcher-Defined Food Environment