| Value | Category | Cases | |
|---|---|---|---|
| 1 | less than 5 minutes | 343 |
19.3%
|
| 2 | 6-15 minutes | 253 |
14.2%
|
| 3 | 16-30 minutes | 130 |
7.3%
|
| 4 | 31-60 | 42 |
2.4%
|
| 5 | more than 1 hour | 70 |
3.9%
|
| 7 | don't know | 942 |
52.9%
|
| Sysmiss | 375 |