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Table 2 Subjects characteristics at baseline and after 24 weeks of personal vaporiser use

From: Success rates with nicotine personal vaporizers: a prospective 6-month pilot study of smokers not intending to quit

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
  1. Abbreviations: SD Standard Deviation, M Male, F Female, eCO exhaled carbon monoxide.
  2. ‡p value – within group Wilcoxon Signed Rank Test.
  3. †Parametric data expressed as mean (±SD).
  4. *Non-parametric data expressed as median (interquartile range (IQR)).