Study Dates of study Geographic location Mode of data collection Validity & reliability of measure Sample size Response rate Representativeness of sample Definition of dietary supplements (nonsupplement CAM surveyed are not listed) Definition of use
Ackman et al. (1999) [7 ] July 1995–June 1996 Canada, Alberta Patient survey Piloted survey 180 75% Respondents and nonrespondents comparable in age and gender Vitamins/minerals, nutritional supplements, health food or herbal products Used at least once weekly over last 3 months
Ai and Bolling (2002) [8 ] May 1999–December 2000 US, Michigan Face-to-face interview followed by telephone interview — 225 48% — Herbal medicine, megavitamins, homeopathy, folk remedies Use in last 1 year
Albert et al. (2009) [9 ] April 2007–February 2008 US, Ohio & Pennsylvania Telephone or face-to-face interview Survey reviewed by research committee 374 — — Herbal therapies —
Amira and Okubadejo (2007) [10 ] 3 month period Nigeria, Lagos Face-to-face interview — 225 — — Dietary supplements and herbs —
Artz et al. (2006) [11 ]Data from 2000-2002 Minnesota Heart Survey US, Minnesota Face-to-face interview Validated interview, trained interviewers 315 — Respondents compared to local census data Nonvitamin/mineral dietary supplement, vitamin/mineral dietary supplement. Use in last 2 weeks
Barraco et al. (2005) [12 ] 3 month period US, Michigan Face-to-face interview Trained Interviewers 223 26% — Folk remedies, herbal therapy, homeopathy, megavitamin therapy (not daily vitamin), minerals (not calcium or iron), native American medicine, Tibetan medicine, traditional Chinese medicine Use in last 12 months
Buettner et al. (2007) [13 ]Data from 1999-2000 and 2001-2002 National Health and Nutrition Examination Surveys US Face-to-face interview — 1066 and 2482 82% and 84% Representative respondents sampled Vitamins, minerals, other dietary supplements Use in last 1 month
Chagan et al. (2005) [14 ] February 2001–December 2002 US, New York Face-to-face interview — 198 — — Herbal supplements, vitamins, mineral supplements Use in last 12 months
Dal Corso et al. (2007) [15 ] August-September 2005 Italy, Verona Face-to-face interview — 153 57% — Herbal remedies, integrators (vitamins, minerals, salts) Ever used
Gohar et al. (2008) [16 ] February–April 2006 UK, Birmingham Face-to-face interview — 153 79% — Alternative medical system, Vitamin supplements, dietary supplement, herbal medicine Use in last 1 year Krasuski et al. (2006) [17 ] — US, Texas Patient survey — 210 75% — Herbal medications, vitamin supplements (unless prescribed), dietary supplements Use in last 6 months
Liu et al. (2000) [18 ] March–May 1998 US, New York Patient survey — 263 70% — Chelation, herbs, homeopathy, naturopathy, nutritional therapy, vitamins Ever used
Pharand et al. (2003) [19 ] December 1998–February 1999 Canada, cross-country Patient survey Survey used in Ackman et al. (1999) [7 ] 306 — Respondents distributed across country similarly to population Vitamins or mineral products, nutritional supplements, health food or herbal products (home remedies, oriental remedies) Used daily or at least once weekly in last 6 months
Shafiq et al. (2003) [20 ] May 2001–October 2001 India, Chandigarh Face-to-face interview — 521 100% — Herbal medicine, homeopathy Current and past use
Stys et al. (2004) [21 ] — US, New York Physician interview — 187 — — Vitamin, mineral or herbal supplements Current (medication history)
Wong et al. (2003) [22 ] May 2001 Hong Kong Physician interview — 107 100% NA Herbal decoctions, proprietary medicines containing herbs, “cool tea”, “herbal soup”, tonics Use in last 1 week
Wood et al. (2003) [23 ] — Canada, Nova Scotia Telephone interview Trained interviewers 107 88% Respondents younger (64 versus 69) but similar gender mix to nonrespondents Megavitamins, herbal therapy, nutritional supplements, homeopathy, folk remedies, chelation —
Yeh et al. (2006) [6 ]Data from 2002 National Health Interview Survey US Face-to-face interview — 10572 74% Representative respondents sampled Alternative medical systems, chelation, folk medicine, herbal products, large-dose vitamins, special diets Ever used, used in last 12 months
Yilmaz et al. (2007) [24 ] — Turkey Face-to-face interview Survey piloted 310 — — Herbals Ever used, use daily, duration of use
Zick et al. (2005) [25 ] January 2000–February 2004 US, Michigan Patient survey — 252 80% — Herbs, vitamins, minerals, amino acids, other Use in last 6 months
