Table 1.
Measurement of variables included in analyses
| Variable | Measurement | |
|---|---|---|
| Daily travel | Daily travel time (By work, maintenance, and discretionary) | Ratio scale |
| Peak travel participation (By work, maintenance, and discretionary) | Nominal | |
| Peak travel morning and evening, Peak travel morning only | ||
| Peak travel evening only, No peak travel | ||
| Initial departure from home in minutes | Ratio scale | |
| Daily work | Total daily work time in minutes | Ratio scale |
| Daily work locations | Nominal | |
| Home only, Other home only, Café/library only, Vehicle only, Unspecified only, Workplace and home only, Workplace and other home only, Workplace and café/library only, Workplace and vehicle only, Workplace and unspecified only, Workplace and 2 or more, Home not workplace and 1 or more | ||
| Employment characteristics | Is part time worker | Binary |
| Is paid hourly | Binary | |
| Occupation | Nominal | |
| Industry | Nominal | |
| Family and demographic characteristics | Education level | Ordinal |
| Is married | Binary | |
| Number of children | Ratio scale | |
| Family income | Ordinal | |
| Is female | Binary | |
| Race | Nominal | |
| Age in years | Ordinal | |
| Locational and time characteristics | In metro area | Binary |
| Day of the week | Nominal | |
| State | Nominal | |
| Year | Nominal |
Italics indicate the category names for selected nominal variables