| Value | Category | Cases | |
|---|---|---|---|
| 1 | No, never | 401264 |
91.9%
|
| 2 | Yes, once | 30709 |
7%
|
| 3 | Yes, twice or more | 4717 |
1.1%
|
| 7 | N/A | 25551 | |
| 8 | Invalid | 556 | |
| 9 | Missing | 22693 |