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Table 1 Demographics of study subjects. Gender male in n (% of column totals), other variables in mean±SD. CPD: cigarettes per day. eCO exhaled carbon monoxide. * Age at assessment

From: The genetics of smoking in individuals with chronic obstructive pulmonary disease

 

Baseline

Year 1

Year 5

 

Smokers

Smokers

Quitters

Continuous smokers

Sustained quitters

Intermittent quitters

N (%)

4102

2946

1156

2175

717

1210

Age* (years)

48.6 ± 6.7

49.4 ± 7

50.0 ± 6.7

53.3 ± 6.7

54.2 ± 6.6

53.7 ± 6.7

Gender (male)

2853 (63%)

1837 (62%)

746 (65%)

1366 (63%)

481 (67%)

736 (61%)

BMI (kg/m2)

25.5 ± 3.8

25.7 ± 3.9

27.3 ± 4.0

26.0 ± 4.2

28.4 ± 4.3

27.5 ± 4.2

FEV1% predicted

78.6 ± 9.0

78.0 ± 9.8

81.8 ± 9.5

72.8 ± 12.0

80.3 ± 10.9

77.2 ± 11.5

eCO (ppm)

32.4 ± 16.1

24.8 ± 13.2

4.8 ± 2.5

25.4 ± 13.8

4.0 ± 2.4

9.6 ± 11.1

Cotinine (ng/ml)

361.4 ± 199.3

302.7 ± 146.3

92.2 ± 158.7

343.1 ± 195.3

27.8 ± 132.4

117.5 ± 229.6

CPD cigarettes/day

21.9 ± 14.5

21.9 ± 14.5

0 ± 0

23.0 ± 12.9

0 ± 0

5.3 ± 10.2