ALB and susceptibility to pneumonia measurement: All factors that were statistically significant (i.e., p < 0.05) in the univariate analysis were included in the logistic multivariate analysis, including length of hospital stay, sex, pneumonia, hypertension, hyperlipidemia, CHD, EVD, tracheotomy, PCT, LaC, CRP, BET, Alb, BUN, and WBC.