| Value | Category |
|---|---|
| -9 | Don't know |
| -7 | Legal skip |
| -6 | Unfinished questionnaire |
| -3 | Interviewer error |
| 0 | LESS THAN ONE MONTH OR FOUND WHILE STUDYING |
| 1 | |
| 2 | |
| 3 | |
| 4 | |
| 5 | |
| 6 | |
| 7 | |
| 8 | |
| 9 | |
| 10 | |
| 11 | |
| 12 | |
| 14 | |
| 15 | |
| 16 | |
| 18 | |
| 19 | |
| 20 | |
| 21 | |
| 23 | |
| 24 | |
| 30 | |
| 31 | |
| 36 | |
| 38 | |
| 48 | |
| 49 | |
| 54 | |
| 60 | |
| 72 | |
| 84 | |
| 120 | |
| 132 | |
| 144 | |
| 152 | |
| 156 | |
| 160 | |
| 168 | |
| 216 | |
| 228 | |
| 240 | |
| Sysmiss |