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The aim of this meta-analysis was to assess the efficacy and safety of propofol sedation for colonoscopy in comparison with traditional sedative agents. We performed a systematic search of PubMed, Embase, Scopus, Web of Science CENTRAL (Cochrane Central Register of Controlled Trials) and Google Scholar databases to identify eligible randomized controlled trials (RCTs) published before November 2019, and compared the effect of traditional sedative agents (TA) with the effect of propofol/propofol combined with TAs for routine colonoscopy. We included 22 eligi