| Value | Category | Cases | |
|---|---|---|---|
| -9 | NIU (not in universe) | 119 |
5.2%
|
| 1 | easy to obtain method | 2023 |
87.6%
|
| 2 | hard to obtain method | 131 |
5.7%
|
| 8 | don't know/unsure | 0 |
0%
|
| 98 | 37 |
1.6%
|
|
| 9999995 | missing:impute | 0 |
0%
|
| Sysmiss | 473 |