LDHAL6B and chronic obstructive pulmonary disease: Multivariate analysis identified that LDH-L, RDW-SD, and D-Dimer were independent risk factors of PE in COPD patients, with odds ratios of 1.188 (95% CI, 1.048-1.348; p = 0.007), 1.012 (95% CI, 1.001–1.023; p = 0.032), and 1.516 (95% CI, 1.042–2.205; p = 0.030), respectively.