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Dr G Parkes, The Limes Surgery, Hoddesdon, UK; email@example.com
randomised controlled trial.
blinded (outcome assessors).*
5 general practices in Hertfordshire, UK.
561 current smokers ⩾35 years of age (mean age 53 y, 54% women, mean 17 cigarettes/day, mean 33 pack-years of smoking). Patients who were receiving oxygen or had a history of lung cancer, tuberculosis, asbestosis, silicosis, bronchiectasis, or pneumonectomy were excluded.
all patients had spirometry at baseline to measure forced expiratory volume at 1 second (FEV1). Patients in the intervention group (n = 280) were immediately given their results verbally and graphically as “lung age” (age of the average healthy person who has an FEV1 equal to that of the patient); patients in the control group (n = 281) were not told their results …
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