| Value | Category | Cases | |
|---|---|---|---|
| 1 | (a) one month only | 234 |
48.2%
|
| 2 | (b) two months | 12 |
2.5%
|
| 3 | (c) three months | 154 |
31.8%
|
| 96 | (96) Other specify | 85 |
17.5%
|
| Sysmiss | 15 |