| Value | Category | Cases | |
|---|---|---|---|
| 1 | More than usual | 4 |
0.1%
|
| 2 | About the same | 15 |
0.5%
|
| 3 | Less than usual | 31 |
1.1%
|
| 4 | None | 0 |
0%
|
| 5 | missing | 0 |
0%
|
| 6 | Other | 0 |
0%
|
| 8 | dtk | 0 |
0%
|
| 9 | na | 2720 |
98.2%
|
| Sysmiss | 34 |