| Value |
Category |
| 100 |
no days |
| 110 |
10 days |
| 140 |
40 days |
| 201 |
1 month |
| 995 |
the same as first twin - for last twins |
| 998 |
don't know |
| Sysmiss |
|
Warning: these figures indicate the number of cases found in the data file. They cannot be interpreted as summary statistics of the population of interest.