title: [Reliability and validity of modified pulmonary functional status and dyspnea questionnaire in Chinese patients with chronic obstructive pulmonary disease].
abstract: OBJECTIVE
  To determine the reliability and validity of the modified pulmonary functional status and dyspnea questionnaire (PFSDQ-M) Chinese version in patients with chronic obstructive pulmonary disease (COPD) at 2 hospitals in Beijing, China.
  
  
  METHODS
  PFSDQ-M has three domains, i.e., change experienced by patient with activities or activity restriction (CA), dyspnea with activities (DA) and fatigue with activities (FA). Sixty-one patients with COPD in stable condition were assessed by interview with PFSDQ-M Chinese version, modified Medical Research Council dyspnea scale (MMRC), respectively, and underwent pulmonary function test (PFT) and 6-minute walking test (6MWT) on the same day or within one week before interview.
  
  
  RESULTS
  Cronbach's alpha was 0.84, 0.85 and 0.89 for domains of CA, DA and FA of the PFSDQ-M, respectively. Scores of change in activities, dyspnea and fatigue with activities in patients of COPD correlated to their 6-minute walking distance (r = -0.39 to -0.50), FEV(1) (r = -0.28 to -0.36), FEV(1)/FVC (r = -0.27 to -0.37), FEV(1)% of predicted (r = -0.27 to -0.37), dyspnea score in MMRC (r = 0.59 to 0.66) and BODE index (r = 0.40 to 0.51), respectively (all P < 0.01). Degrees of restriction of activity, dyspnea and fatigue with activities varied significantly in patients with different severity of COPD (chi(2) = 7.35 to 15.21, P < 0.05, P < 0.01, respectively).
  
  
  CONCLUSIONS
  Results of 61 patients with COPD interviewed with PFSDQ-M Chinese version suggest its good reliability and validity in discriminating patients with COPD of varied severity and stages.
authors.affiliation: School of Nursing, Peking Union Medical College, Chinese Academy of Medical Sciences, Beijing 100730, China.
authors.forename: Ai-min
authors.initials: AM
authors.lastname: Guo
authors.forename: Jiang-na
authors.initials: JN
authors.lastname: Han
authors.forename: Ping
authors.initials: P
authors.lastname: Wang
authors.forename: Ying-xiang
authors.initials: YX
authors.lastname: Lin
authors.forename: Zheng-lai
authors.initials: ZL
authors.lastname: Wu
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D004417:Dyspnea / Q000503:physiopathology*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D029424:Pulmonary Disease, Chronic Obstructive / Q000503:physiopathology*; D012129:Respiratory Function Tests; D011795:Surveys and Questionnaires