Current and ex-smokers had lower mean exercise capacity compared with never smokers: 90 [standard deviation (SD) 10] % predicted,91 (SD 12) % predicted and 100 (SD 13) % predicted distance on 6MWT, respectively [mean differences −9.8%, 95% confidence intervals (CI) −17.8 to −1.8 and −9.1%, 95% CI −15.4 to −2.7, respectively; P < 0.05 for both]. The level of physical activity did not differ between the groups, but was found to correlate negatively with the level of nicotine dependence in current smokers (r = −0.47, P = 0.03). The median score for the mental health dimension of SF-36 was worse in passive {72 [inter quar tile range (IQR) 56 to 96] points} and current [76 (IQR55 to 80) points] smokers compared with ex-smokers [88 (IQR 70 to 100) points] (median differences −16 points, 95% CI −22.2 to −3.0and −12 points, 95% CI −22.8 to −2.4, respectively; P < 0.05 for both).
Current and ex-smokers had lower mean exercise capacity compared with never smokers: 90 [standard deviation (SD) 10] % predicted,91 (SD 12) % predicted and 100 (SD 13) % predicted distance on 6MWT, respectively [mean differences −9.8%, 95% confidence intervals (CI) −17.8 to −1.8 and −9.1%, 95% CI −15.4 to −2.7, respectively; P < 0.05 for both]. The level of physical activity did not differ between the groups, but was found to correlate negatively with the level of nicotine dependence in current smokers (r = −0.47, P = 0.03). The median score for the mental health dimension of SF-36 was worse in passive {72 [inter quar tile range (IQR) 56 to 96] points} and current [76 (IQR55 to 80) points] smokers compared with ex-smokers [88 (IQR 70 to 100) points] (median differences −16 points, 95% CI −22.2 to −3.0and −12 points, 95% CI −22.8 to −2.4, respectively; P < 0.05 for both).
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Current and ex-smokers had lower mean exercise capacity compared with never smokers: 90 [standard deviation (SD) 10] % predicted,91 (SD 12) % predicted and 100 (SD 13) % predicted distance on 6MWT, respectively [mean differences −9.8%, 95% confidence intervals (CI) −17.8 to −1.8 and −9.1%, 95% CI −15.4 to −2.7, respectively; P < 0.05 for both]. The level of physical activity did not differ between the groups, but was found to correlate negatively with the level of nicotine dependence in current smokers (r = −0.47, P = 0.03). The median score for the mental health dimension of SF-36 was worse in passive {72 [inter quar tile range (IQR) 56 to 96] points} and current [76 (IQR55 to 80) points] smokers compared with ex-smokers [88 (IQR 70 to 100) points] (median differences −16 points, 95% CI −22.2 to −3.0and −12 points, 95% CI −22.8 to −2.4, respectively; P < 0.05 for both).
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