title: Physical functional capacity in idiopathic pulmonary fibrosis: performance characteristics of the continuous-scale physical function performance test.
abstract: BACKGROUND
  Physical functional capacity is impaired in idiopathic pulmonary fibrosis (IPF). There is no tool to measure this key clinical outcome. The continuous-scale physical function performance (CS-PFP) test is one that assesses activities of daily living, but it has never been used in IPF.
  
  
  METHODS
  We determined internal consistency of the CS-PFP. We used correlations to assess the strength of association between CS-PFP scores and various parameters of IPF severity, and compared the CS-PFP scores between patients with IPF and published values from a healthy control group.
  
  
  RESULTS
  Sixteen subjects completed the test and retest. Test-retest reliability (0.84, p = 0.003) and internal consistency (Cronbach's α = 0.91) were excellent. Subjects with IPF had significantly worse CS-PFP scores than controls (46.0 ± 11.1 vs 58.7 ± 12.5, p = 0.001). In IPF, the CS-PFP scores correlated moderately to very strongly with several disease severity variables.
  
  
  CONCLUSIONS
  The CS-PFP is a reliable and valid tool in IPF.
authors.affiliation: National Jewish Health, Interstitial Lung Disease Program and Autoimmune Lung Center, Denver, CO, USA.
authors.forename: Amy L
authors.initials: AL
authors.lastname: Olson
authors.forename: Jeffrey J
authors.initials: JJ
authors.lastname: Swigris
authors.forename: Amanda
authors.initials: A
authors.lastname: Belkin
authors.forename: Linda
authors.initials: L
authors.lastname: Hannen
authors.forename: Kunihiro
authors.initials: K
authors.lastname: Yagihashi
authors.forename: Margaret
authors.initials: M
authors.lastname: Schenkman
authors.forename: Kevin K
authors.initials: KK
authors.lastname: Brown
mesh_terms: D000203:Activities of Daily Living; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D006801:Humans; D054990:Idiopathic Pulmonary Fibrosis / Q000175:diagnosis* / Q000503:physiopathology*; D008297:Male; D008875:Middle Aged; D012720:Severity of Illness Index
keywords: idiopathic pulmonary fibrosis; interstitial lung disease; patient-oriented outcome; physical functional capacity; validity