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. 2014 Dec 16;14:204. doi: 10.1186/1471-2466-14-204

Table 1.

eCO values (ppm) provided by B&K and PiCO+ in the healthy volunteers enrolled in this study

Smokers Non-smokers
Males Females Total Males Females Total
N = 8 N = 11 N = 19 N = 7 N = 8 N = 15
B&K 21.8 16.3 18.3 11.2 10.4 10.9
(31.71) (28.35) (28.35) (2.15) (4.16) (5.17)
PiCO+ 23.8 15.9 19.2 4.3 3.2 3.7
(13.27) (12.94) (13.54) (4.5) (3.4) (3.4)

Values are stratified by gender and smoking habits and reported as medians (ranges: max-min values).