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