Table 4.

Severity of Illness and Hospital Mortality According to the Number of Organs with Failure.

Group	n	Age*	APACHE II Score*	Hospital Mortality (%)**	HR (95% CI)**
ARF+0	138	57.5±17.8	19.0±7.2	21.0%	1.0
ARF+1	248	57.1±19.2	19.9±7.4	37.1%	1.91 (1.26-2.89)
ARF+2	285	58.7±17.3	22.7±7.6	54.4%	3.35 (2.26-4.99)
ARF+3	249	58.5±17.3	24.9±8.4	64.7%	4.19 (2.82-6.23)
ARF+4	139	54.0±17.5	26.6±9.2	69.8%	4.62 (3.05-6.99)
ARF+5	56	52.4±19.9	25.3±7.3	73.2%	5.24 (3.25-8.43)

APACHE II = Acute Physiology and Chronic Health Evaluation II; ARF = acute respiratory failure; HR = hazard ratio; CI = confidence interval;

<?ENTCHAR ast?>: mean±standard deviation;

<?ENTCHAR ast?><?ENTCHAR ast?>: p-value for linear trend: hospital mortality (p<0.001) and HR (p<0.001).