The Duke Activity Status Index in Patients with Chronic Kidney Disease: A Reliability Study

Summary Background and objectives Exercise capacity is impaired at a younger age in CKD patients than in the general population. This study examined the reliability of the Duke Activity Status Index (DASI) questionnaire as a measure of exercise capacity in medically stable adults with stage 3–4 CKD (estimated GFR [eGFR], 15–59 ml/min per 1.73 m 2 ). Design, setting, participants, & measurements Peak oxygen uptake (o 2 peak), estimated from DASI responses and cardiopulmonary exercise test measurements, was obtained at baseline and 6 months in a derivation sample ( n =23) and once in a validation sample ( n =20). Bland–Altman analysis and linear mixed models were used to estimate bias, concordance correlation coefficients, and intraclass correlation coefficients as the proportion of the variance due to participant (intertest reliability) and method (test–retest reliability). Results The two samples were homogeneous with respect to age (mean 60±14 years), eGFR (35.5±15 ml/min per 1.73 m 2 ), male sex (53%), and diabetes (56%). Mean measured o 2 peak was 16.5±4 ml/kg per min. The DASI questionnaire overestimated o 2 peak by 4.3 ml/kg per min. Intertest reliability was 53% when eGFR was ≥35 ml/min per 1.73 m 2 (median) and 60% when eGFR was 2 ( P 2 and 71% when eGFR was ≥35 ml/min per 1.73 m 2 ( P Conclusions The DASI questionnaire may be a reliable measure of exercise capacity in CKD patients, especially when eGFR is 2 . Larger prospective studies are needed to determine its prognostic value.