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目的 Asweknownreductionofdiffusingcapacityisrelationwithinducebreathlessness.However,howreduceddiffusingcapacityrelatestootherrespiratorysignsandsymptomsremainsunknown.Theaimsofthisstudyweretoutilizedanepidemiologicalstudyinvestigaterelationshipbetweenpackyears,asthma,occupationalexposure,respiratorysymptomsandDLCO.