“…MDRD, CG and CKD-EPI equations were used to estimate GFR in 45 studies (n = 167,011 participants), 19 studies (n = 59,414 participants) and 14 studies (n = 41,791 participants) respectively. Thirty-one studies (n = 111,415 participants) used MDRD [ 32 – 35 , 37 – 45 , 48 , 51 – 54 , 57 , 59 , 62 , 65 – 69 , 82 , 84 , 85 , 89 ] equation only; 7 (n = 16,756 participants) used CKD–EPI [ 76 – 80 , 83 , 86 ] and 9 (n = 24,622 participants) used CG only [ 23 , 70 – 75 , 81 ]. Seven articles (n = 31,268 participants) applied MDRD and CG [ 36 , 50 , 55 , 56 , 60 , 64 , 87 ]; 4 (n = 20,742 participants) applied MDRD and CKD-EPI [ 46 , 47 , 49 , 58 ] while 3 (n = 4,275 participants) applied all 3 equations [ 61 , 63 , 88 ].…”