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• W2783402234 abstract "Background Cigarette smoking is the strongest risk factor for COPD. Smoking burden is frequently measured in pack-years, but the relative contribution of cigarettes smoked per day versus duration towards the development of structural lung disease, airflow obstruction and functional outcomes is not known. Methods We analysed cross-sectional data from a large multicentre cohort (COPDGene) of current and former smokers. Primary outcome was airflow obstruction (FEV 1 /FVC); secondary outcomes included five additional measures of disease: FEV 1 , CT emphysema, CT gas trapping, functional capacity (6 min walk distance, 6MWD) and respiratory morbidity (St George’s Respiratory Questionnaire, SGRQ). Generalised linear models were estimated to compare the relative contribution of each smoking variable with the outcomes, after adjustment for age, race, sex, body mass index, CT scanner, centre, age of smoking onset and current smoking status. We also estimated adjusted means of each outcome by categories of pack-years and combined groups of categorised smoking duration and cigarettes/day, and estimated linear trends of adjusted means for each outcome by categorised cigarettes/day, smoking duration and pack-years. Results 10 187 subjects were included. For FEV 1 /FVC, standardised beta coefficient for smoking duration was greater than for cigarettes/day and pack-years (P<0.001). After categorisation, there was a linear increase in adjusted means FEV 1 /FVC with increase in pack-years (regression coefficient β=−0.023±SE0.003; P=0.003) and duration over all ranges of smoking cigarettes/day (β=−0.041±0.004; P<0.001) but a relatively flat slope for cigarettes/day across all ranges of smoking duration (β=−0.009±0.0.009; P=0.34). Strength of association of duration was similarly greater than pack-years for emphysema, gas trapping, FEV 1 , 6MWD and SGRQ. Conclusion Smoking duration alone provides stronger risk estimates of COPD than the composite index of pack-years. Trial registration number Post-results; NCT00608764 ." @default.
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• W2783402234 date "2018-01-11" @default.
• W2783402234 modified "2023-10-15" @default.
• W2783402234 title "Smoking duration alone provides stronger risk estimates of chronic obstructive pulmonary disease than pack-years" @default.
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• W2783402234 doi "https://doi.org/10.1136/thoraxjnl-2017-210722" @default.
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