| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 |
0%
|
| 0 | Never | 30371 |
66.3%
|
| 1 | Once or twice | 5351 |
11.7%
|
| 2 | A few times | 4931 |
10.8%
|
| 3 | Often | 4988 |
10.9%
|
| 8 | Refused | 67 |
0.1%
|
| 9 | Don't know | 115 |
0.3%
|