“…The majority of the studies assessed the clinical effectiveness of liraglutide without an active comparator (81.4%; N = 35) [28, 29, 31, 34, 36–39, 41–49, 51–55, 57, 60–64, 66–71]. Real-world studies with comparators were less frequently observed (18.6%; N = 8); the most common comparators for liraglutide were: sitagliptin or any DPP-4i ( N = 6) [32, 33, 35, 40, 56, 58], exenatide ( N = 3) [33, 35, 50], glimepiride or any other SUs ( N = 2) [30, 35], pioglitazone or other TZDs ( N = 1) [35], and MET ( N = 1) [35]; note: these numbers do not add up because some studies had more than one comparator.…”