Validation of the Chinese version of the Functional Performance Inventory Short Form in patients with chronic obstructive pulmonary disease

Aims and objective. To determine the reliability and validity of the Chinese version of the Functional Performance Inventory Short Form (FPI‐SF‐C) in patients with chronic obstructive pulmonary disease in Beijing, China. Background. The Functional Performance Inventory Short Form (FPI‐SF) is a 32‐item instrument designed to measure self‐reported functional performance of patients with chronic obstructive pulmonary disease. This instrument had not been translated into Mandarin Chinese and tested for use in mainland China. Design. Cross‐sectional validation study with a two‐week test of reproducibility. Method. The FPI‐SF was translated using forward and backward translation procedures and administered to 108 stable chronic obstructive pulmonary disease patients from outpatient clinics of three hospitals in Beijing, China. Pulmonary function and six‐minute walking distance (6‐MWD) tests were performed on the same day or within one week before the FPI‐SF‐C completion. Thirty of the patients participated in the reproducibility assessment. Results. Cronbach’s alpha for the FPI‐SF‐C total score was 0·89; subscales ranged from 0·70 (Body Care)–0·89 (Spiritual activities). Test–retest reliability (intraclass correlation coefficient) was 0·93 with subscales ranging from 0·73 (Body Care)–0·96 (Household Maintenance). No ceiling or floor effects were observed for total FPI‐SF‐C score. Total scores correlated significantly (p