Abstract P49 Table 1
Coefficient of variationCOPDControlOverallRange
Isoprene2326242–64
TVOC-isoprene40404012–104
% Change from reading 1COPD 2/1COPD 3/1Control 2/1Control 3/1
Isoprene
 Median−7−25−24−32
 Mean (geometric)−10−26−22−37
TVOC-isoprene
 Median+14−6+20−30
 Mean (geometric)+9−6+3