Glomerular filtration rate was estimated by the CKD-EPI equation ( eGFR ) and patients grouped by eGFR : eGFR group-I , 90 ml/min/1 .73 m ( 2 ) ; eGFR group-II , 60-89 ml/min/1 .73 m ( 2 ) ; and eGFR group-III , 59 ml/min/1 .73 m ( 2 ) .