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Table 3 Comparison of the size of convex hulls (CH) derived from questionnaire and CH derived from GPS (n = 23) and prompted recall data (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

  CH Size (km2) Ratio of CH sizes: questionnaire to comparison data source
Median (IQRa) Median (IQR)
Questionnaire and GPS (n = 23)
Questionnaire activity locations 2. 6 (1.0, 6.3) N.A
GPS tracks 27.8 (11.7, 186.9) 4.1 (1.2, 41. 5)
GPS activity locations 5.9 (2.1, 58.7) 27.7 (1.9, 74.0)
Questionnaire and prompted recall survey (n = 31)
Questionnaire activity locations 2.6 (1.0, 6.7) N.A
Prompted recall activity locations 15.5 (6.0, 69.2) 10.8 (3.4, 61.1)
  1. aIQR: Interquartile range = 25th percentile, 75th percentile.