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Table 2 Distance separating questionnaire activity locations from GPS tracks and GPS activity locations (n = 23) and prompted recall locations (n = 31) collected in Montreal, Canada in 2011

From: Examining the spatial congruence between data obtained with a novel activity location questionnaire, continuous GPS tracking, and prompted recall surveys

  Distance in meters separating a questionnaire location from …
  … closest point on GPS track (n = 23) … closest GPS activity location (n = 23) … closest prompted recall location (n = 31)
Questionnaire activity purpose na Median (IQRb) n Median (IQR) n Median (IQR)
All purposes 23 5 (1, 24) 23 90 (27, 382) 31 9 (1, 146)
Home 23 1 (0.4, 3) 23 22 (13, 45) 31 1 (1, 2)
Studies 8 5 (1, 24) 8 77 (39, 118) 12 111 (6, 291)
Work1 19 3 (1, 5) 19 65 (35, 101) 24 1 (0.09, 21)
Work2 5 0.7 (0.3, 10) 5 22 (9, 1,411) 8 2 (1, 669)
Grocery shopping1 22 16 (6, 37) 22 140 (58, 387) 31 19 (1, 197)
Grocery shopping2 20 13 (4, 65) 20 334 (125, 488) 23 110 (47, 371)
Sports 16 2 (1, 21) 16 202 (25, 573) 20 56 (1, 214)
Leisure 10 7 (1, 200) 10 169 (24, 778) 12 26 (2, 167)
Other1 15 14 (1, 347) 15 96 (21, 762) 19 19 (0.08, 398)
Other2 9 10 (1, 510) 9 320 (39, 1476) 11 300 (16, 1248)
  1. anumber of participants having reported a given activity.
  2. bIQR: Interquartile range = 25th percentile, 75th percentile.