The LQG group had greater improvements in the 6-minute walk test ( P = .02 ) ; specific airway conductance ( P = .02 ) ; monitored functional task evaluation ( P = .04 ) ; Medical Outcomes Study 36-item Short-Form Health Survey ( SF-36 ; general health ( P < .001 ) , mental health ( P = .03 ) ) ; Chronic Respiratory Questionnaire ( dyspnea ( P = .05 ) , emotion ( P = .05 ) , and mastery ( P = .04 ) at 6-month follow-up .