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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.