title: Validation of the Chinese version of the Functional Performance Inventory Short Form in patients with chronic obstructive pulmonary disease.
abstract: 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.
  
  
  METHODS
  Cross-sectional validation study with a two-week test of reproducibility.
  
  
  METHODS
  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<0·05) with 6-MWD (r=0·56), modified Medical Research Council Dyspnoea Scale (MMRC) (r=-0·55), BODE index (r=-0·47), forced expiratory volume in one second (FEV(1)) (r=0·41) and FEV(1) % of predicted (r=0·26) and differentiated patients based on GOLD rating of COPD severity (χ(2)=16·22, p<0·001).
  
  
  CONCLUSIONS
  Results suggest the FPI-SF-C is a reliable and valid instrument for measuring functional performance in mainland Chinese patients with chronic obstructive pulmonary disease. Further psychometric testing in a wide range of subjects and an evaluation of its utility in clinical practice are warranted.
  
  
  CONCLUSIONS
  The FPI-SF-C may be useful for understanding difficulties in functional performance and evaluating the effect of treatment in Chinese patients with chronic obstructive pulmonary disease.
authors.affiliation: School of Nursing, Peking Union Medical College, Beijing, China.
authors.forename: Ai-Min
authors.initials: AM
authors.lastname: Guo
authors.forename: Jiang-Na
authors.initials: JN
authors.lastname: Han
authors.forename: Nancy Kline
authors.initials: NK
authors.lastname: Leidy
authors.forename: Zheng-Lai
authors.initials: ZL
authors.lastname: Wu
authors.forename: Ping
authors.initials: P
authors.lastname: Wang
authors.forename: Ying-Xiang
authors.initials: YX
authors.lastname: Lin
mesh_terms: D000368:Aged; D002681:China; D003430:Cross-Sectional Studies; D015444:Exercise; D006801:Humans; D007802:Language; D008875:Middle Aged; D029424:Pulmonary Disease, Chronic Obstructive / Q000503:physiopathology*; D012129:Respiratory Function Tests