Table 1. Age and gender distributions and D-dimer levels of COPD patients with and without PE.

	COPD with PE	COPD without PE	P
n (%)	56 (37.8)	92 (62.2)
Age ± SD (years)	73.39±10.19	73.3±7.46	0.955
Sex, n (%)			0.741
Male	40 (71.4)	68 (73.9)
Female	16 (28.6)	24 (26.1)
D-dimer ± SD (pg/mL)	2.38±2.80	1.06±1.51	<0.001

COPD, chronic obstructive pulmonary disease; PE, pulmonary embolism; SD, standard deviation.