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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