Correlation between high-resolution computed tomography features and patients' characteristics in chronic obstructive pulmonary disease.

Ann Thorac Med · 2008 · PMC2700439 · PMID 19561886

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highly significantno p-value reported

Tracheal index was observed to have a highly significant negative correlation with age, duration of illness, pack years, dyspnea scale, and AQ30 score.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.