title: Influence of body mass index on changes in disease-specific quality of life of veterans completing pulmonary rehabilitation.
abstract: OBJECTIVE
  Body mass index (BMI) has prognostic value in patients with chronic lung disease. Pulmonary rehabilitation improves quality of life. This study investigated whether BMI predicts change in disease-specific quality of life following pulmonary rehabilitation.
  
  
  METHODS
  Subjects (N = 61), who completed pulmonary rehabilitation, were classified by BMI as low (<23 kg/m), middle (> or =23 and <33 kg/m), or high (> or =33 kg/m). Outcomes were changes in disease- specific quality of life measured by the following domains of the Chronic Respiratory Questionnaire Self-Reported (CRQ-SR): dyspnea, mastery, emotion, and fatigue. Subjects completed CRQ-SR at the start and end of pulmonary rehabilitation. Multivariable regression was used to compare change in CRQ-SR scores of each domain by BMI group controlling for forced expiratory volume in 1 second.
  
  
  RESULTS
  Subjects were 68.9 +/- 9.0 years old and were all white men. At baseline, the low-BMI group had lower mean forced expiratory volume in 1 second (0.96 +/- 0.28) than the middle (1.29 +/- 0.48, P = .02) and high (1.37 +/- 0.38, P = .01) BMI groups. Collectively, subjects improved on CRQ-SR dyspnea (P < .004), mastery (P < .008), emotion (P < .03), and fatigue (P < .005). In multivariable models, the high-BMI group had greater improvement on the CRQ-SR domains for fatigue (beta = 3.5 +/- 1.0, P = .0008) and mastery (beta = 4.8 +/- 1.6, P = .003) than the middle-BMI group.
  
  
  CONCLUSIONS
  Pulmonary rehabilitation results in improved disease-specific quality of life. BMI influences this improvement and should be considered in the assessment, plan of care, and outcomes in response to pulmonary rehabilitation for patients with chronic respiratory disease.
authors.affiliation: Warren Alpert Medical School of Brown University, Providence, Rhode Island, USA.
authors.forename: Robert
authors.initials: R
authors.lastname: Velasco
authors.forename: Paul A
authors.initials: PA
authors.lastname: Pirraglia
authors.forename: Brian
authors.initials: B
authors.lastname: Casserly
authors.forename: Linda
authors.initials: L
authors.lastname: Nici
mesh_terms: D000368:Aged; D015992:Body Mass Index; D015331:Cohort Studies; D005541:Forced Expiratory Volume; D006304:Health Status; D006305:Health Status Indicators; D006801:Humans; D008297:Male; D015233:Models, Statistical; D015999:Multivariate Analysis; D011379:Prognosis; D029424:Pulmonary Disease, Chronic Obstructive / Q000523:psychology / Q000534:rehabilitation*; D011788:Quality of Life / Q000523:psychology*; D012044:Regression Analysis; D011795:Surveys and Questionnaires; D014481:United States; D014728:Veterans