| Variable | Year | Supplement |
|---|---|---|
| I_500 | 1992 | Family resources |
| I_501 | 1992 | Family resources |
| I_502 | 1992 | Family resources |
| I_503 | 1992 | Family resources |
| I_504 | 1992 | Family resources |
| MATRIX15 | 1991 | Family resources |
| MATRIX15 | 1990 | Family resources |
| MATRIX16 | 1991 | Family resources |
| MATRIX16 | 1990 | Family resources |
| MATRIX17 | 1991 | Family resources |
| MATRIX17 | 1990 | Family resources |