Variable | Year | Supplement |
---|---|---|
CONTACLN | 1988 | Occupational health |
CONTACT | 1984 | Study on aging |
CONTLENS | 1977 | Hearing |
GLASCTLN | 1981 | Child health |
SELAID | 1980 | Person (core questionnaire) |
SELAIDU | 1979 | Person and home care |
USECONTL | 1971 | Person (core questionnaire) |