| Value | Category | 
|---|---|
| 1 | More than two hours each day (10+ hours/week) | 
| 2 | About one hour each day (~5 hrs/ week) | 
| 3 | About a half hour each day (~3hrs/week) | 
| 4 | A few minutes each day (<1 hr/week) | 
| 5 | None (0) | 
| 2147483622 | Don't know | 
| 2147483623 | Refused to answer | 
| 2147483624 | Outlier set to missing | 
| 2147483625 | Inconsistency set to missing | 
| 2147483647 | Not applicable | 
| 11 | .Z |