The baseline characteristics of study population.
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https://figshare.com/articles/dataset/_The_baseline_characteristics_of_study_population_/744128
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Abbreviations: COPD, chronic obstructive pulmonary disease. Data are expressed as mean (standard deviation or SD) or percentage as indicated.
*data not available.
**P values were calculated by using unpaired t-test for age, and by χ2 test for other categorical characteristics.
创建时间：
2013-07-11
