Questionnaires and hand devices

First author [ref.]YearCountrySample sizeSample populationCombinationCut-offSensitivity %Specificity %AUC
Fujita [38]2020Japan1001No previous diagnosis of asthma, TB and lung cancerChanged CDQ and COPD-6 scoreJoined score ≥2787.873.10.87
Sichletidis[26]2011Greece1078≥40 years of age and no previous diagnosis of COPDCDQ and Piko-6Questionnaire score ≥17 and post-bronchodilator FEV1/FEV6 <0.77297NA

AUC: area under the curve; TB: tuberculosis; CDQ: COPD diagnostic questionnaire; FEV1: forced expiratory volume in 1 s; FEV6: forced expiratory volume in 6 s; NA: not available.