Table 3.

Classification table for the admission Acute Physiology and Chronic Health Evaluation (APACHE) II model and the worst 24-hour APACHE II model to predict hospital mortality

Observed hospital mortality	Predicted hospital mortality
	No (n)	Yes (n)	% correct
Using the worst 24-hour APACHE II model
No	8,899	394	95.8
Yes	1,229	585	32.2
Overall percentage			85.4
Using the admission APACHE II model
No	8,966	327	96.5
Yes	1,293	521	28.7
Overall percentage			85.4

The cutoff value is 0.50.