Fig. 2From: Mid-term clinical outcomes and complications of primary total knee arthroplasty in hemodialysis patients: a retrospective comparative cohort studyCovariate balance in the comparative study. The bar chart shows the changes in the standardized mean difference before (black) and after (white) matching. BMI: body mass index, Hb: hemoglobin, Plt: platelet, Alb: albumin, AKSS: American Knee Society ScoreBack to article page