NPPB and chronic obstructive pulmonary disease: However, NTproBNP levels was comparable in patients with and without COPD (683 pg/mL, IQR: 965–502 vs. 663 pg/mL, IQR: 1122–492; P = 0.64) and those with or without dementia (514 pg/mL, IQR: 703–432 vs. 668 pg/mL, IQR: 1102–494; P = 0.14).