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).