Procalcitonin is not an independent predictor of 30-day mortality, albeit predicts pneumonia severity in patients with pneumonia acquired outside the hospital

Table 3 Univariate and multivariate analyses of factors related to 30-day mortality of patients older than 75 years-old

	Univariate Logistic Regression			Multivariate Logistic Regression
Variable	OR	95%CI	P value	OR	95%CI	P value
Age (years)	1.05	1.00–1.10	0.04^c	1.02	0.96-1.08	0.60
Sex^a	1.27	0.70–2.32	0.43
Category of pneumonia^b	2.14	1.18–3.86	0.01^c	0.86	0.38-1.95	0.71
PSI class	4.24	2.59–6.94	< 0.01^c	2.02	1.05-3.88	0.04^c
BMI (kg/m²)	0.80	0.73–0.88	< 0.01^c	0.84	0.75-0.94	< 0.01^c
Albumin (g/dL)	0.38	0.26–0.54	< 0.01^c	0.31	0.14-0.66	< 0.01^c
PCT (ng/mL)	1.02	1.00–1.03	0.04^c	1.01	0.98-1.03	0.62
CRP (mg/dL)	1.04	1.00–1.07	0.02^c	1.01	0.97-1.06	0.56
WBC(/mm³)	1.00	1.00–1.00	0.29
BUN(mg/dL)	1.04	1.02–1.05	< 0.01^c	1.01	0.99-1.03	0.24
CCI	1.27	1.00–1.62	0.04^c	1.07	0.77-1.48	0.69

OR Odds ratio, Cl Confidence interval, PSI Pneumonia severity index, BMI Body mass index, PCT Procalcitonin, CRP C-reactive protein, WBC White blood cell, BUN Blood urea nitrogen, CCI Charlson comorbidity index
^a Female vs male
^b Healthcare-associated pneumonia vs community acquired pneumonia
^cStatistically significant

ISSN: 1471-2318