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Comparison of characteristics between exacerbators and no exacerbators
Data are presented as mean ± standard deviation. Numbers in parentheses are percentage of subjects. FEV1 = Forced expiratory volume in 1 second; FVC, Forced vital capacity; Emphysema index, the volume fraction of the lung below -950 Hounsfield Units (HU) at full inspiration; Wall area, % = wall area/(wall area + lumen area) × 100. Air trapping index, ratio of mean lung density on expiration and inspiration × 100.
