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Table 2 Characteristics of Included Studies

From: The impact of peppermint oil on the irritable bowel syndrome: a meta-analysis of the pooled clinical data

Year Author Country Design Setting N Enrolled N Completed Duration of therapy
2013 Alam Bangladesh Double-Blind RCT University Single-Center 74 65 6 weeks
2016 Cash USA Double-Blind RCT Multicenter 72 70 4 weeks
2005 Capanni Italy Double-Blind RCT University Single-Center 178 173 12 weeks
2007 Cappello Italy Double-Blind RCT University Single-Center 57 50 4 weeks
1989 Carling Sweden Double-blind Cross Over 3-arm RCT 1-Week Washout 2 University Centers 40 38 2 weeks
1984 Dew Wales Double-Blind Cross Over Washout Period Multicenter 29 29 2 weeks
1988 Lech Dutch Double-Blind RCT University Single-Center 47 42 4 weeks
1997 Liu China Double-Blind RCT University Single-Center 110 101 4 weeks
2009 Merat Iran Double-blind RCT University Single- Center 90 60 8 weeks
1979 Rees UK Double-Blind Cross Over Washout Period Defined by Recurrence of Active Symptoms University Single- Center 18 16 3 weeks
1990 Schneider USA Double-blind Cross Over RCT
2-Week Washout
University Single- Center 60 47 6 weeks
1988 Weiss Germany Single blinded, RCT Hospital, single center 60 46 3 weeks