| Value | Category | Cases | |
|---|---|---|---|
| -99 | Refused | 1 |
0.1%
|
| -98 | Don't know | 53 |
3.1%
|
| -97 | N/A: less frequently than once per month; only on rare occasions | 96 |
5.7%
|
| 1 | Day | 1298 |
76.6%
|
| 2 | Week | 237 |
14%
|
| 3 | Month | 10 |
0.6%
|
| Sysmiss | 7644 |