TABLE 1.
Definitions and Data Sources for Variables Related to Pedestrian–Motor Vehicle (PMV) Collisions: Denver, CO, 2000–2003
| Variable Type | Definition | Source | |
| Density of PMV collisions | Dependent | Total PMV collisions per 1 000 000 sq ft in tract | Department of Public Works, City and County of Denver |
| Population density | Independent | Total population per 1 000 000 sq ft in tract | US Census Bureau |
| Economic indicator | Independent | Proportion of labor force aged ≥ 16 y unemployed in tract | US Census Bureau |
| Educational attainment | Independent | Proportion of population aged ≥ 25 y with a high school degree as highest level of education in tract | US Census Bureau |
| Proportion of population aged ≥ 25 y with a college degree or higher in tract | |||
| Age structure | Independent | Proportion of population aged < 18 y in tract | US Census Bureau |
| Proportion of population aged > 64 y in tract | |||
| Hispanic ethnicity | Independent | Proportion of population identifying as Hispanic in tract | US Census Bureau |
| Walking to work | Independent | Proportion of labor force aged ≥ 16 y who walk or take public transport as their main mode of transportation to work in tract | US Census Bureau |
| Business land use | Independent | Proportion of total land dedicated to business use in tract | Technology Services Department, City and County of Denver |
| Density of liquor license outlets | Independent | Total liquor license outlets per 1 000 000 sq ft in tract | Department of Revenue, State of Colorado |