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Table 6 Data on FEV1 decline (in mL/year) in continuing smokers by amount smokeda

From: Systematic review of the evidence relating FEV1decline to giving up smoking

  

Stratifying variables

  

Study no.

Reference

Sex

Age

Otherb

Amount smoked

(cigarettes/day)c

Beta (SE)

4

Burchfiel et al. [11]

M

45-68

-

1-19, 20-29, 30-39, 40+

29.8 (3.5), 32.4 (2.0), 35.5 (2.8), 34.3 (2.7)

12

Ferris et al. [29]

M

25-74

-

1-24, 25+

0.0 (5.7), 6.7 (5.8)

  

F

25-74

-

1-24, 25+

1.7 (4.4), 1.7 (8.3)

13

Fletcher et al. [6]

M

30-59

F1

1-5, 6-15, 16-25, 26+

45.0 (5.0), 55.0 (4.0), 74.0 (5.0), 63.0 (6.0)

  

M

30-59

F2

1-5, 6-15, 16-25, 26+

37.0 (6.0), 49.0 (4.0), 51.0 (4.0), 45.0 (10.0)

  

M

30-59

F3

1-5, 6-15, 16-25, 26+

39.0 (4.0), 39.0 (4.0), 38.0 (5.0), 52.0 (11.0)

22

Lange et al. [42]

M

20-54

-

1-14, 15+

22.0 (6.0), 42.0 (5.0)

  

M

55+

-

1-14, 15+

52.0 (3.0), 56.0 (6.0)

  

F

20-54

-

1-14, 15+

17.0 (4.0), 30.0 (4.0)

  

F

55+

 

1-14, 15+

39.0 (3.0), 48.0 (5.0)

29

Xu et al. [54]

M

25-34

-

1-14, 15-24, 25+

36.5, 20.6, 41.7

  

M

35-44

-

1-14, 15-24, 25+

30.4, 40.3, 39.0

  

M

45-54

-

1-14, 15-24, 25+

55.0, 57.4, 68.8

  

M

55-64

-

1-14, 15-24, 25+

49.0, 53.8, 68.5

  

M

65-78

-

1-14, 15-24, 25+

66.8, 54.1, 73.4

  

M

25-74

-

1-14, 15-24, 25+

37.4 (6.0), 47.2 (3.6), 59.9 (3.5)

  

F

25-34

-

1-14, 15-24, 25+

16.5, 21.9, 28.0

  

F

35-44

-

1-14, 15-24, 25+

28.9, 35.8, 36.9

  

F

45-54

-

1-14, 15-24, 25+

32.5, 45.7, 37.8

  

F

55-64

-

1-14, 15-24, 25+

42.7, 52.0, 50.4

  

F

65-78

-

1-14, 15-24, 25+

29.4, 47.9, 37.4

  

F

25-74

-

1-14, 15-24, 25+

31.2 (2.4), 42.0 (1.8), 38.9 (2.5)

31

Tashkin et al. [57]

M

25-59

-

1-20, 21+

77.8 (6.2), 81.8 (5.0)

  

F

25-59

-

1-20, 21+

52.3 (3.3), 61.7 (3.7)

32

Xu et al. [4]

M

25-54

-

1-14, 15-24, 25+

18.8 (5.3), 26.3 (4.2), 33.2 (4.9)

  

F

25-54

-

1-14, 15-24, 25+

15.0 (4.0), 20.4 (5.1), 30.1 (7.6)

  1. aFor details of length of follow-up and number of adjustment variables, see Table 3. bOther stratifying variables are indicated as follows: F1, F2, F3 = forced expiratory volume in 1 second (FEV1) at baseline <55, 55-64, 65+ cL/m3. cFor the purposes of estimating mean cigarettes/day for an interval, a simple average of the upper and lower limits was used, with the upper limit for the final interval taken as 50 cigarettes/day.