Variable | Year | Supplement |
---|---|---|
HEARREAR | 1991 | Hearing |
HEARREAR | 1990 | Hearing |
HEARREAR | 1977 | Hearing |
HEARRGT | 1999 | Sample adult questionnaire |
HRRIGHT | 2008 | Sample adult questionnaire |
HRRIGHT | 2007 | Sample adult questionnaire |
PS_490 | 1971 | Hearing |