TY - JOUR T1 - Discriminative Properties and Validity of a Health Status Questionnaire in Obstructive Airway Disease Patients: The Airways Questionnaire 20 JO - Archivos de Bronconeumología T2 - AU - Camelier,Aquiles AU - Rosa,Fernanda W. AU - Nascimento,Oliver A. AU - Fernandes,Ana Luiza G. AU - Jardim,Jose R. SN - 15792129 M3 - 10.1016/S1579-2129(07)60152-9 DO - 10.1016/S1579-2129(07)60152-9 UR - https://www.archbronconeumol.org/en-discriminative-properties-validity-health-status-articulo-S1579212907601529 AB - OBJECTIVETo evaluate the discriminative properties and validity of the Airways Questionnaire 20 (AQ20) in a sample of airway obstructed patients and to compare its properties with those of the St George's Respiratory Questionnaire (SGRQ) and the Short Form 36 (SF-36). PATIENTS AND METHODSA convenience sample of 47 subjects was recruited from among 61 consecutive patients referred to an outpatient clinic specialized in airway obstructive diseases. All subjects completed the AQ20, SGRQ, and SF-36. Other measures were the baseline dyspnea index (BDI),6-minute walk test (6MWT) distance, spirometry, results of arterial blood gas analysis, and body mass index. RESULTSThe AQ20 showed very good correlation with the SGRQ total score (ρ = 0.84, P < .001) and moderate correlation with all SF-36 domains (physical capacity, ρ = −0.53;physical functioning,ρ = −0.61;bodily pain, ρ = −0.55;general health,ρ = −0.59;vitality,ρ = − 0.55;;social functioning,ρ = −0.57; emotional role functioning,ρ = −0.51; mental health,ρ = −0.61;all P < .001).The BDI and the 6MWT were the best predictors of AQ20 score (r2 = 0.31) in the regression model. An area under the receiver operating characteristic curve of 0.91 (P < .001) indicated a high level of accuracy for the AQ20, using the SGRQ as the gold standard. CONCLUSIONThis study shows that the AQ20 is an accurate health status questionnaire in patients with moderate-to-severe airway obstruction. It could be an alternative to longer, traditional questionnaires such as the SGRQ. ER -