| Value | Code Name | Code | Code System | Code Description |
|---|---|---|---|---|
| 0 | None | None | ||
| 1 | 1-4 hours | 1-4 hours | ||
| 2 | 5-9 hours | 5-9 hours | ||
| 3 | 10-19 hours | 10-19 hours | ||
| 4 | 20-34 hours | 20-34 hours | ||
| 5 | 35 or more hours | 35 or more hours | ||
| 9 | Don't Know/not sure/refused | Don't Know/not sure/refused |