Table 1.

Variable selection in existing pedestrian crash frequency studies.

Group	Variable	Studies
Roadway design	Road length or density of different road (sidewalks, local streets, and arterials) Intersections/crosswalks Bus stops/stations	(Cai et al., 2016; Chen and Zhou, 2016; Moudon et al., 2011; Narayanamoorthy et al., 2013; Siddiqui et al., 2012; Ukkusuri et al., 2011; Ukkusuri et al., 2012; Wang and Kockelman, 2013; Wier et al., 2009) (Cai et al., 2016; Chen and Zhou, 2016; Miranda-Moreno et al., 2011; Moudon et al., 2011; Pulugurtha and Sambhara, 2011; Siddiqui et al., 2012; Ukkusuri et al., 2011; Ukkusuri et al., 2012) (Chen and Zhou, 2016; Miranda-Moreno et al., 2011; Moudon et al., 2011; Pulugurtha and Sambhara, 2011; Ukkusuri et al., 2011; Ukkusuri et al., 2012)
Land use	Land use mix Number of parcels or percentages of different types of land use Zone size Number of schools / universities	(Chen and Zhou, 2016; Ukkusuri et al., 2011; Wang and Kockelman, 2013) (Chen and Zhou, 2016; Moudon et al., 2011; Narayanamoorthy et al., 2013; Pulugurtha and Sambhara, 2011; Siddiqui et al., 2012; Ukkusuri et al., 2012; Wang and Kockelman, 2013; Wier et al., 2009) (Moudon et al., 2011; Wang and Kockelman, 2013; Wier et al., 2009) (Cai et al., 2016; Miranda-Moreno et al., 2011; Moudon et al., 2011; Narayanamoorthy et al., 2013; Ukkusuri et al., 2011; Ukkusuri et al., 2012)
Demographics	Population/employment density Poverty level / median household income Senior citizen/ teenager/ children Race	(Cai et al., 2016; Chen and Zhou, 2016; Moudon et al., 2011; Narayanamoorthy et al., 2013; Pulugurtha et al., 2007; Ukkusuri et al., 2011; Ukkusuri et al., 2012; Wang and Kockelman, 2013; Wier et al., 2009) (Moudon et al., 2011; Narayanamoorthy et al., 2013; Siddiqui et al., 2012; Wier et al., 2009) (Narayanamoorthy et al., 2013; Wier et al., 2009) (Ukkusuri et al., 2011; Ukkusuri et al., 2012)
Travel demand	Walk miles travelled Pedestrian/ traffic volume Walking mode share / Number of commuters for a mode	(Wang and Kockelman, 2013) (Miranda-Moreno et al., 2011; Moudon et al., 2011; Pulugurtha et al., 2007; Pulugurtha and Sambhara, 2011; Wier et al., 2009) (Cai et al., 2016; Chen and Zhou, 2016; Narayanamoorthy et al., 2013)
Traffic control	Speed limit	(Cai et al., 2016; Chen and Zhou, 2016; Miranda-Moreno et al., 2011; Moudon et al., 2008; Moudon et al., 2011; Narayanamoorthy et al., 2013; Pulugurtha and Sambhara, 2011; Siddiqui et al., 2012; Ukkusuri et al., 2011; Ukkusuri et al., 2012; Wang and Kockelman, 2013; Wier et al., 2009)