Table 2.

Subjects characteristics at baseline and after 24 weeks of personal vaporiser use

Parameter	At Baseline	At 24-Weeks Post PV use	p value‡
Sustained >50% (excluding quitters; includes sustained >80% reducers ) reduction in cigarette smoking (n = 15)
Age	39.9 (±8.7)†
Sex	10 M; 5 F
Smoking Pack Years	31.1 (±16.5)†
Cigarettes/day	25 (20, 30)*	6 (3.5, 6)*	<0.001
eCO	18 (13, 32.5)*	10 (7, 11.5)*	<0.001
Sustained >80% (excluding quitters) reduction in cigarette smoking (n = 7)
Age	40.3 (±11.2)†
Sex	6 M; 1 F
Smoking Pack Years	32.6 (±20.6)†
Cigarettes/day	25 (18, 32.5)*	3 (3, 5)*	<0.001
eCO	17 (13, 33)*	10 (5, 10)*	0.016
Sustained 100% (quitters) reduction in cigarette smoking (n = 18)
Age	40.2 (±8.9)†
Sex	12 M; 6 F
Smoking Pack Years	30.9 (±13.5)†
igarettes/day	25 (20.5, 25)*	0 (0, 0)*	<0.001
eCO	23 (17.5, 29.3)*	3 (2.3, 4)*	<0.001
Smoking Failure (<50% smoking reduction) (n = 5)
Age	45.0 (±7.3)†
Sex	2 M; 3 F
Smoking Pack Years	32 (±18.5)†
Cigarettes/day	20 (20, 25)*	20 (20, 20)*	0.732
eCO	18 (16, 32)*	28 (17, 31)*	0.819
Lost to Follow-up (n = 12)
Age	42.2 (±10.2)
Sex	6 M; 6 F
Smoking Pack Years	31.9 (±10.6)
Cigarettes/day	25 (20, 30)	N/A	N/A
eCO	24 (19.8, 34.5)	N/A	N/A

Abbreviations: SD Standard Deviation, M Male, F Female, eCO exhaled carbon monoxide.

‡p value – within group Wilcoxon Signed Rank Test.

†Parametric data expressed as mean (±SD).

*Non-parametric data expressed as median (interquartile range (IQR)).