Descriptive Characteristics of Study Sample (n = 1348)
| Variable | Mean (SD) |
|---|---|
| Age | 50.2 (13.46) |
| n (%) | |
| Gender | 368 (27.9) |
| Male | 950 (72.1) |
| Female | |
| Race/ethnicity | |
| White | 508 (41.1) |
| Hispanic | 302 (24.4) |
| African American | 427 (34.5) |
| Smoking status | |
| Smoker | 274 (20.4) |
| Nonsmoker | 1068 (79.6) |
Abbreviations: SD, standard deviation.
Participants are defined as people who signed up for the NRP registry to be contacted and recruited for future research projects.