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Lifetime prevalence (%) of comorbid conditions.
Notes: aHeart disease: including cardiac arrhythmia, cardiac insufficiency, narrow coronary vessel, and angina pectoris. bPsychiatric disorder: including anxiety, depression, and psychosis. cMental deficiency: including weakness of memory, restlessness, disorientation, and confusion. dOther lung disease: fibrosis, sarcoidosis, and bronchiectasis.
