Thinking about the most recent time you traveled to the United States from another country—please tell me which box shows the kind of transportation you took: A, B, or C.
| Code | Label |
|---|---|
| 1 | Box a |
| 2 | Box b |
| 4 | Other |
| 8 | Dont know |
| 9 | No answer |
| 0 | Not applicable |
| 2004 |
|---|
| 21 |
| 225 |
| 7 |
| 12 |
| 8 |
| 2539 |
| Valid cases | 253 |
| Missing cases | 64561 |