| Value |
Category |
| 1 |
IHS (1992) |
| 2 |
MS1 (1993) |
| 3 |
MS2 (1994) |
| 4 |
MS3 (1995/96) |
| 5 |
MS4 (1996/97) |
| 6 |
UNHS (1999/00) |
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.