| Value | Category | Cases | |
|---|---|---|---|
| 1 | No, never | 217562 |
93.1%
|
| 2 | Yes, once | 13901 |
5.9%
|
| 3 | Yes, twice or more | 2190 |
0.9%
|
| 7 | N/A | 23927 | |
| 8 | Invalid | 353 | |
| 9 | Missing | 13390 |