| Value | Category | Cases | |
|---|---|---|---|
| 1 | No, never | 106171 |
90.2%
|
| 2 | Yes, once | 9012 |
7.7%
|
| 3 | Yes, twice or more | 2499 |
2.1%
|
| 7 | N/A | 150144 | |
| 8 | Invalid | 245 | |
| 9 | Missing | 3252 |