Figure 2From: Smallest detectable change in volume differs between mass flow sensor and pneumotachographTotal error variance (= between apparatus, between occasion and random variation) for vital capacity (VC), transfer factor for carbon monoxide (DLCO), alveolar volume and DLCO/VA measured on three apparatuses. * p < 0.05 for random variation between mass flow sensor (MF) and pneumotachograph (PT) measurements.Back to article page