Table 8.

Exhaled breath biomarker summary and statistical comparisons.

	Exclusive E-Cigarette use groups			Dual use groups
Biomarker	Classic tobacco rechargeable N = 15	Cherry rechargeable N = 13	Cherry disposable N = 13	Classic tobacco rechargeable N = 14	Cherry rechargeable N = 15	Cherry disposable N = 13	Nicotine cessation N = 13
CO (ppm)
Day −1	27.2 ± 10.5	27.3 ± 6.9	26.9 ± 6.4	25.1 ± 7.3	25.4 ± 7.7	24.7 ± 5.5	29.3 ± 10.4
Day 5	2.9 ± 0.8	2.9 ± 0.8	2.7 ± 0.9	17.3 ± 5.7	16.1 ± 3.3	18.2 ± 5.7	2.8 ± 0.7
p value Day −1 vs Day 5	<0.0001	<0.0001	<0.0001	0.0021	<0.0001	0.0002	<0.0001
p value Day 5 vs Cessation	0.7990	0.8033	0.9109	<0.0001	<0.0001	<0.0001	NA
NO (ppb)
Day −1	14.8 ± 12.8	11.5 ± 4.8	10.0 ± 4.0	14.9 ± 11.1	10.6 ± 4.6	14.3 ± 13.5	11.3 ± 4.0
Day 5	23.3 ± 21.6	15.5 ± 9.0	14.3 ± 6.5	12.9 ± 6.3	10.7 ± 4.4	11.4 ± 6.0	16.8 ± 10.1
p value Day −1 vs Day 5	0.0075	0.1325	0.0053	0.3118	0.9415	0.3287	0.0321
p value Day 5 vs Cessation	0.2370	0.6031	0.5674	0.0313	0.0615	0.0119	NA

Values are presented as mean ± SD. A paired t-test was used to make the Day −1 vs Day 5 within group comparisons, a linear mixed model was used to make the Day 5 comparisons to the Cessation group.