| UL Holders | Others | |
|---|---|---|
| Sample | 800 | 1,200 |
| Completed | 342 | 423 |
| Not located | 223 | 482 |
| Located-not available | 158 | 199 |
| Located-refused | 55 | 79 |
| [Ineligible] | [22] | [17] |
| Total | 778 | 1,183 |
| Completion rate | 44% | 36% |
SOURCE: Bureau of Transportation Statistics, 2001 Mariner Survey Principal Findings