. Author manuscript; available in PMC: 2018 Jul 1.

Published in final edited form as: Cancer Epidemiol Biomarkers Prev. 2017 Mar 3;26(7):1078–1084. doi: 10.1158/1055-9965.EPI-16-0927

Table 1.

Exposure measures, definitions, and method of calculation.

Exposure Measure	Definition	Method of Calculation
Walkability: Static	Walkability of the 800m area around the participant's home.	Home 800m buffer multiplied by walkability raster.
Walkability: Total Dynamic	Walkability of the 200m area around the participant's daily movement, weighted by density of GPS points in any given location.	KDE of all participant GPS points multiplied by walkability raster.
Walkability: Activity Dynamic	Walkability of the 200m area around the participant's daily physical activity, weighted by density of physical activity GPS points in any given location.	KDE of all participant physical activity GPS points multiplied by walkability raster.
Recreation Area: Static	Recreation area in the 800m area around the participant's home.	Home 800m buffer multiplied by recreation area raster.
Recreation Area: Total Dynamic	Recreation area in the 200m area around the participant's daily movement, weighted by density of GPS points in any given location.	KDE of all participant GPS points multiplied by recreation area raster.
Recreation Area: Activity Dynamic	Recreation area in the 200m area around the participant's daily physical activity, weighted by density of physical activity GPS points in any given location.	KDE of all participant physical activity GPS points multiplied by recreation area raster.