Table 2. Characteristics associated with mortality in a univariate Cox regression analysis in patients with PCP.

	Unadjusted HR(95% CI)	P-value	Unadjusted HR(95% CI)	P-value
Age, years	1.03 (0.97–1.09)	0.40	1.04 (0.99–1.09)	0.10
Gender, male	1.22 (0.27–5.43)	0.80	0.05 (0.00–518.81)	0.51
oxygenation index≤300	69.19 (0.16–30395.79)	0.17	4.11 (1.34–12.57)	0.01
Neu%≥85%	6.75 (0.81–56.11)	0.08	7.32 (2.25–23.81)	0.001
Lym%≤10%	62.96 (0.14–27618.67)	0.18	3.88 (1.27–11.86)	0.02
ALB≤25 g/L	2.39 (0.53–10.66)	0.26	2.39 (0.66–8.69)	0.19
ALB≤30 g/L	42.84 (0.07–24998.30)	0.25	3.44 (1.06–11.17)	0.04
Pct≥0.5 ng/ml	9.37 (1.81–48.44)	0.008	19.34 (5.30–70.57)	<0.001
CD4 cell count≤50 cells/µl	-	-	4.89 (0.64–37.58)	0.13
four or more clinical manifestations (cough, dyspnea, fever, chest pain, and weight loss)	14.31 (1.72–119.18)	0.01	1.08 (0.36–3.22)	0.89
Coinfection	13.36 (1.61–111.12)	0.02	0.82 (0.25–2.68)	0.75
Admission to ICU	11.99 (1.44–99.74)	0.02	52.71 (11.55–240.52)	<0.001
Mechanical ventilation	110.98 (0.19–63845.43)	0.15	91.90 (11.88–711.12)	<0.001
Time from admission to initial treatment, days	1.05 (0.99–1.12)	0.08	1.01 (1.00–1.02)	0.02

ALB  =  albumin; CI  =  confidence interval; HR  =  hazard ratio; ICU  =  intensive care unit; Lym  =  lymphocyte; Neu  =  neutrophil; Pct  =  procalcitonin.