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Table 4 Spatial overlap between questionnaire-derived convex hulls (CH) and GPS (n = 23) and prompted recall convex hulls (n = 31) based on data 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

  Spatial overlap as % of questionnaire CH Spatial overlap as % of comparison data source CH
Median (IQRa) Median (IQR)
Questionnaire and GPS (n = 23)
Questionnaire activity locations N.A N.A
GPS tracks 100 (94.7, 100) 4.0 (1.2, 25.6)
GPS activity locations 78.5 (37.1, 98.1) 11.9 (1.4, 49.8)
Questionnaire and prompted recall survey (n = 31)
Questionnaire activity locations N.A N.A
Prompted recall activity locations 99.3 (89.1, 100) 10.7 (3.4, 57.7)
  1. aIQR: Interquartile range = 25th percentile, 75th percentile.