Figure 2From: Normal values of exhaled carbon monoxide in healthy subjects: comparison between two methods of assessment Correlation between eCO values (ppm), obtained with Brüel&Kjær 1312 and PiCO + Smokerlyzer, in the subjects enrolled in the study. The measures taken into account were 102 (3 measurements for each of 34 subjects). The Identity line (Y = X; grey dashed line) is reported.Back to article page