Survey year | 1996 | 2001 | 2006 | 2011 |
---|---|---|---|---|
Pre-reform group | ||||
Participated | 277 | 272 | 182 | 158 |
Did not participate | 174 | 127 | 138 | 97 |
Died before surveya | – | 52 | 131 | 196 |
Total | 451 | 451 | 451 | 451 |
Post-reform group | ||||
Participated | 74 | 86 | 71 | 75 |
Did not participate | 124 | 100 | 89 | 59 |
Died before survey | – | 12 | 38 | 64 |
Total | 198 | 198 | 198 | 198 |