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

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

	Spatial overlap as % of questionnaire CH	Spatial overlap as % of comparison data source CH
	Median (IQR^a)	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)