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Table 3 Correlation between CURB-65 score/PSI and independent variables including age, body mass index, and nutritional parameters

From: Nutritional parameters affecting severity of pneumonia and length of hospital stay in patients with pneumococcal pneumonia: a retrospective cross-sectional study

Multivariate linear regression analysis
1. Factors associated with PSI in the ≥65-year-old group (r = 0.467; r 2 = 0.219; adjusted r 2 = 0.196)
 Independent variable B (95 % CI) β t VIF P
 Age 1.477 (0.504–2.450) 0.467 3.084 1.000 0.004*
2. Factors associated with CURB-65 score in the <65-year-old group (r = 0.618; r 2 = 0.382; adjusted r 2 = 0.313)
 Independent variables B (95 % CI) β t VIF P
 Age 0.030 (0.004–0.056) 0.450 2.429 1.001 0.026*
 Serum cholinesterase −0.005 (−0.009 to −0.000) −0.409 −2.208 1.001 0.040*
3. Factors associated with PSI in the <65-year-old group (r = 0.728; r 2 = 0.529; adjusted r 2 = 0.477)
 Independent variables B (95 % CI) β t VIF P
 Age 2.096 (0.962–3.229) 0.629 3.886 1.001 0.001*
 Serum cholinesterase −0.205 (−0.406 to −0.004) −0.347 −2.142 1.001 0.046*
  1. (r = 0.467; r 2 = 0.219; 2 adjusted r 2 = 0.196)
  2. r multiple correlation coefficient, r 2 coefficient of determination, B nonstandardized regression coefficient, CI confidence interval; β standardized regression coefficient; VIF variance inflation factor.
  3. *P < 0.05