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. The gene discussed is LCT; the disease is pneumonia.