Table 6.

Area under curve

Test result variable	Area chart	The standard errora	Asymptotically significant levelb	95% CI
Lower limit	Upper limit
COPD	0.541	0.026	0.108	0.490	0.592
ICU admission	0.568	0.025	0.007	0.519	0.617
Duration of mechanical ventilation	0.586	0.025	0.001	0.536	0.636
Number of central venous catheter	0.565	0.027	0.001	0.513	0.617
Duration of indwelling urinary catheter	0.596	0.026	0.000	0.545	0.647
Number of antibiotics use	0.564	0.023	0.011	0.519	0.610
Use of corticosteroids before MV	0.547	0.026	0.065	0.496	0.598
Forecast probability	0.722	0.022	0.000	0.679	0.765

Notes: ^aAssume nonparametric. ^bOriginal hypothesis: real area =0.5

Abbreviations: ICU, intensive care unit; MV, mechanical ventilation.