Table 15 Meta-analyses for duration of quitting (vs. never smoked)^a

Number of sets^c

10

11

About 12 years^{d, g}

n

10

9

F

3.45 (2.96-4.01)

1.40 (1.21-2.62)

R

2.12 (1.06-4.26)

2.20 (1.33-3.65)

H, P_H

12.74, < 0.001

8.04, < 0.001

About 7 years^{e, g}

n

3

5

F

8.15 (5.88-11.28)

1.83 (1.49-2.25)

R

4.94 (1.21-20.07)

2.36 (1.29-4.32)

H, P_H

14.80, < 0.001

6.52, < 0.001

About 3 years^{f, g}

n

3

7

F

3.58 (2.44-5.25)

2.16 (1.82-2.57)

R

4.08 (0.80-20.77)

2.42 (1.73-3.38)

H, P_H

16.66, < 0.001

2.79, < 0.05

Shortest v longest

n

10

11

F

2.20 (1.76-2.76)

1.29 (1.06-1.56)

R

2.21 (1.24-3.94)

1.25 (0.99-1.59)

H, P_H

4.88, < 0.001

1.29, NS