Quanjer, P.H.

patient function spirometry disease study respir airway children value fev 1 volume reference group subject chest result diagnosis equation 1/fvc obstruction ratio airway obstruction difference lung function health capacity university fev 1/fvc quanjer asthma lung disease fev 1/fvc ratio journal table practice growth population measurement height expiratory expiratory volume european quality hospital support physician figure z-score change netherland number centre society american control lung volumes diaphragmatic hernia limit reference equations sarcoidosi effect guideline female australia adolescent spirometric prediction equations thorax software lung capacity medicine testing indian swets subscription service expert research method range service interpretation