“…Regarding the sampling techniques used, majority ( n = 15, 93.8%) of the included studies used consecutive sampling technique to select study participants [ 9 , 16 , 17 , 20 , 21 , 23 – 25 , 27 – 30 , 82 ]. Concerning the laboratory methods used to diagnose DM, seven studies used FBG [ 17 , 19 , 21 , 28 – 30 ], four used RBS [ 16 , 24 , 25 , 27 ], one each used OGT [ 23 ], HbA1c [ 18 ], and FBG and OGT [ 9 ], two studies did not report the methods used [ 20 , 82 ]. Regarding study settings, seven out of sixteen studies conducted in hospitals [ 19 , 23 , 24 , 26 – 29 ] and five in health centers [ 16 , 18 , 20 , 30 , 82 ].…”