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Table 2 Subject Parameter Outcomes Following 24 Weeks of Electronic Cigarette Use

From: Effect of an electronic nicotine delivery device (e-Cigarette) on smoking reduction and cessation: a prospective 6-month pilot study

Parameter AT BASELINE AT 24-Weeks
Post E-Cigarette
p value‡
Sustained 50% (excluding quitters) reduction in cigarette smoking (n = 13)    
Age 40.1 (± 7.7)† 6 (5, 6)* < 0.001
Sex 8M; 5F 8 (6, 11)* 0.001
Smoking Years 24.5 (± 8.7)†   
Cigarettes/day 25 (20, 30)*   
eCO 18 (14, 33)*   
Sustained 80% (excluding quitters) reduction in cigarette smoking (n = 5)    
Age 40.6 (± 10.4)† 3 (3, 6)* 0.043
Sex 4M; 1F 6 (4, 10)* 0.042
Smoking Years 25.4 (± 11.8)†   
Cigarettes/day 30(25, 35)*   
eCO 15 (14, 44)*   
Sustained 100% (quitters) reduction in cigarette smoking (n = 9)    
Age 44.7 (± 9.3)† 0 (0, 0)* 0.008
Sex 8M; 1F 3 (2, 3)* 0.008
Smoking Years 29 (± 9.6)†   
Cigarettes/day 25 (23, 30)*   
eCO 31 (23, 41)*   
Sustained > 50% (including quitters) reduction in cigarette smoking (n = 22)    
Age 42 (± 8.5)† 3 (0, 6)* < 0.001
Sex 16M; 6F 5.5 (3, 9.5)* < 0.001
Smoking Years 26.3 (± 9.1)†   
Cigarettes/day 25 (20, 30)*   
eCO 27 (15.5, 37.5)*   
Smoking Failure (< 50% smoking reduction) (n = 5)    
Age 45.6 (± 7.9)† 20 (20, 20)* 0.157
Sex 2M; 3F 28 (17, 31)* 0.892
Smoking Years 31.2 (± 7)†   
Cigarettes/day 25 (20, 25)*   
eCO 18 (16, 32)*   
  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)).