Variable | Year | Supplement |
---|---|---|
CHEWTBC | 1993 | Year 2000 |
CHEWTOB | 1970 | Person (core questionnaire) |
UCHEWTN | 1991 | Health promotion disease prevention |
USECHEWN | 1994 | Year 2000 |
USECTNOW | 1992 | Cancer control |
USECTNOW | 1987 | Cancer control |
USETNOW | 1987 | Cancer epidemiology |