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Table 1 Baseline characteristics at randomization

From: A randomized study of contingency management and spirometric lung age for motivating smoking cessation among injection drug users

 

Usual care

Lung age

Contingency management

Lung age + contingency management

p-value

N

26

24

26

24

 

Age, years

52.3 (7.2)

46.1 (8.9)

51.2 (7.5)

49.2 (8.7)

0.09

Female, n (%)

11 (42)

10 (42)

17 (65)

9 (38)

0.18

African American race, n (%)

24 (92)

18 (75)

26 (100)

21 (88)

0.03

Current IDU, n (%)

3 (12)

8 (33)

6 (23)

4 (17)

0.27

Current non-IDU, n (%)

7 (27)

8 (33)

7 (27)

10 (42)

0.64

Current alcohol use, n (%)

15 (58)

12 (50)

12 (46)

12 (50)

0.87

More than 1 drink a day per week, n (%)

15 (58)

12 (50)

12 (46)

12 (50)

0.37

Alcohol or drug treatment in last 6 months, n (%)

9 (35)

10 (42)

4 (15)

9 (38)

0.19

HIV infected, n (%)

6 (23)

4 (17)

4 (15)

6 (25)

0.83

Age first smoked

16.2 (5.0)

16.1 (5.4)

17.1 (5.8)

14.9 (4.4)

0.79

Pack-years, med (IQR)

19.1 (13.7-32)

18.4 (14.1-22.8)

17.8 (11.5-31.0)

20.3 (11.0-35.5)

0.74

Smoking >1 pack per day, n (%)

5 (19)

4 (17)

3 (12)

5 (21)

0.68

Smokers in home, n (%)

18 (69)

20 (83)

15 (58)

19 (79)

0.18

Fagerstrom score, med (IQR)

4 (2–5)

3.5 (2–4)

3.5 (2–5)

4 (3–5.5)

0.54

Pulmonary diagnoses

     

Asthma, n (%)

6 (23)

5 (21)

8 (31)

5 (22)

0.84

COPD, n (%)

3 (12)

4 (17)

2 (8)

2 (9)

0.79

Both, n (%)

7 (27)

7 (29)

9 (35)

5 (22)

0.79

FEV1

     

Absolute (L)

2.58 (0.88)

2.58 (0.78)

2.42 (0.62)

2.72 (0.94)

0.74

% predicted

87.2 (20)

84.1 (19)

86.5 (14)

93.7 (21)

0.42

FVC, (L)

     

Absolute (L)

3.58 (1.27)

3.45 (0.96)

3.18 (0.73)

3.62 (1.13)

0.57

% predicted

96.2 (17)

90.8 (14)

91.4 (12)

99.5 (16)

0.14

FEV1/FVC ratio

0.72 (0.11)

0.74 (0.10)

0.76 (0.06)

0.75 (0.09)

0.62

Lung age

--

60.7 (16)

--

54.2 (19.8)

0.31

Difference btw lung age and actual age, median (IQR)

--

12.5 (5.5 to 28.5)

--

11.0 (-10 to 18.5)

0.12