NPPB and COVID-19: Similarly, Liu et al. [31] found many significantly different laboratory parameters in younger (defined as younger than 60 years old) compared to older COVID-19 patients, including higher lymphocyte counts and albumin levels, and lower neutrophil counts, NLR, PT, and levels of CRP, PCT, D-dimer, LDH, creatinine, and NT-proBNP.