ALB and respiratory tract infectious disorder: However, after conducting multivariate analysis of all the variables in this study, only three factors were found to be significant (Table 5), namely albumin ≤2.5 (OR: 2.363; 95% CI: 1.201–4.649), respiratory infection (OR: 2.414; 95% CI: 1.046–5.571), and antibiotic treatment ≥1 h (OR: 2.181; 95% CI: 1.014–4.689).