| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 |
0.4%
|
| 0 | No time was spent | 170 |
68%
|
| 1 | 11 |
4.4%
|
|
| 2 | 10 |
4%
|
|
| 3 | 15 |
6%
|
|
| 4 | 6 |
2.4%
|
|
| 5 | 10 |
4%
|
|
| 10 | 9 |
3.6%
|
|
| 15 | 5 |
2%
|
|
| 18 | 1 |
0.4%
|
|
| 20 | 7 |
2.8%
|
|
| 25 | 1 |
0.4%
|
|
| 50 | 1 |
0.4%
|
|
| 70 | 1 |
0.4%
|
|
| 80 | 1 |
0.4%
|
|
| 100 | 1 |
0.4%
|