2

Variable: any characteristic, number, or attribute that can be measured or counted Numeric variables have values that describe a measurable quantity as a number, like 'how many' or 'how much' May take any real number value (continuous) or only whole number values (discrete) The data collected for a numeric variable are quantitative data 3

Variable: any characteristic, number, or attribute that can be measured or counted Categorical variables have values that describe a 'quality' or 'characteristic' of a data unit, like 'what type' or 'which category' Categories should be mutually exclusive (in one category or in another) and exhaustive (include all possible options) May have a natural order (ordinal) or not (nominal) The data collected for a categorical variable are qualitative data 4

Source: Australian Bureau of Statistics,

Source: The Association of Faculties of Medicine of Canada (2013), CDC (2013) 6

Source: The Association of Faculties of Medicine of Canada (2013), CDC (2013) 7

8

Source: The Association of Faculties of Medicine of Canada (2013) 9

Host = Pedestrians Agent = Kinetic Energy Environment = Physical & Sociocultural Vector = Vehicles 10

Source: The Association of Faculties of Medicine of Canada (2013) 11

12

13

14

Source: The Association of Faculties of Medicine of Canada (2013) 15

16

Source: The Association of Faculties of Medicine of Canada (2013) 17

Source: The Association of Faculties of Medicine of Canada (2013) 18

19

HostAgent or vector Physical environment Sociocultural environment Pre-event Event Post-event 20

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