Research Article
Trend and Pattern of Herb and Supplement Use in the United States: Results from the 2002, 2007, and 2012 National Health Interview Surveys
Table 1
Prevalence of herb and supplement use among the US adult population in 2002, 2007, and 2012.
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Data source: National Center for Health Statistics, 2002, 2007, and 2012 NHIS Adult Complementary and Alternative Medicine File [20–22]. Note: proportions based on weighted prevalence estimates, values for Wald chi-square tests. aColumn percentage. bThe question of the current herb use was only asked in 2007 and 2012 NHIS. na: not available. *. **. |