| Value | Category | Cases | |
|---|---|---|---|
| 1 | No, never | 398132 |
92.3%
|
| 2 | Yes, once | 28466 |
6.6%
|
| 3 | Yes, twice or more | 4680 |
1.1%
|
| 7 | N/A | 24533 | |
| 8 | Invalid | 569 | |
| 9 | Missing | 29110 |