| Variable | Year | Supplement |
|---|---|---|
| AHCBIO | 1999 | Sample adult questionnaire |
| BIO_USEM | 2012 | Alternative health |
| BIO_USEM | 2007 | Alternative health |
| BIO_USEM | 2002 | Alternative health |
| CBI_USEM | 2012 | Child complementary and alternative medicine |
| CBI_USEM | 2007 | Child complementary and alternative medicine |