“…(23) to investigate potential causes of high heterogeneity between studies. Given the small number of studies (less than ten), meta-regression was not performed; rather, subgroup analysis was repeated using the random effect model according to trial characteristics (participants with baseline HbA1c levels <9%; (27,32,34,36,37) interventions such as drug-related problems (27,32,34,37,40) and medication review; (28,29) frequent interventions -monthly or every 2 months; (21,26,29,30,32,35,40,42) outpatient settings (21,26,27,(30)(31)(32)(33)(34)(35) and community pharmacy; (29,37) ) per sex (i.e., studies with larger proportion of males (29,34,41,42) versus studies with larger proportion of females). (21,27,28,32,37,39) All analyses revealed high and significant heterogeneity (I 2 >98%; p<0.001).…”