\           *P* value[a](#tfn0-copd-0-000){ref-type="table-fn"}                                                                   n = 0000       n = 0000          --------------------------------------------------------------- -------------- -------------- -----------------------------------------------------   Age, mean (SD)                                                  00.0 (00.00)   00.0 (00.00)   0.00    Male, n (%)                                                     0000 (00.0)    0000 (00.0)    0.00    **Comorbid