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1.  Physical Performance and Frailty in Chronic Kidney Disease 
American journal of nephrology  2013;38(4):307-315.
Background
Poor physical performance and frailty are associated with elevated risks of death and disability. Chronic kidney disease (CKD) is also strongly associated with these outcomes. The risks of poor physical performance and frailty among CKD patients, however, are not well established.
Methods
We measured the Short Physical Performance Battery (SPPB, a summary test of gait speed, chair-raises and balance; range 0–12) and the five elements of frailty among 1111 Chronic Renal Insufficiency Cohort participants. Adjusting for demographics and multiple comorbidities, we fit a linear regression model for the outcome of SPPB score and an ordinal logistic regression model for frailty status.
Results
Median (interquartile range [IQR]) age was 65 (57–71) years, median estimated glomerular filtration rate (eGFR) for non-dialysis patients was 49 (36–62) ml/min/1.73m2, and median SPPB score was 9 (7–10). Seven percent of participants were frail and 43% were pre-frail. Compared with the SPPB score for eGFR >60 ml/min/1.73m2, the SPPB was 0.51 points lower for eGFR 30 – 59; 0.61 points lower for eGFR 15 – 29; and 1.75 points lower for eGFR <15; (p<0.01 for all comparisons). eGFR 30 – 59 (OR 1.45; p=0.024), eGFR 15 – 29 (OR 2.02; p=0.002) and eGFR <15 (OR 4.83, p<0.001) were associated with worse frailty status compared with eGFR >60 ml/min/1.73m2.
Conclusions
CKD severity was associated with poor physical performance and frailty in a graded fashion. Future trials should determine if outcomes for CKD patients with frailty and poor physical performance are improved by targeted interventions.
doi:10.1159/000355568
PMCID: PMC4019506  PMID: 24107579
Physical performance; frailty; chronic kidney disease

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