| Variable | Year | Supplement |
|---|---|---|
| COVERED4 | 1992 | Health insurance |
| COVSTAT4 | 1996 | Health insurance |
| COVSTAT4 | 1995 | Health insurance |
| COVSTAT4 | 1994 | Health insurance |
| COVSTAT4 | 1993 | Health insurance |
| PECOVPL4 | 1989 | Health insurance |
| PECOVPL4 | 1986 | Health insurance |
| PECOVPL4 | 1984 | Health insurance |
| PECOVPL4 | 1983 | Health insurance |
| PECOVPL4 | 1982 | Health insurance |
| PECOVPL4 | 1980 | Health insurance |