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

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)*