Table 3.

Derivation and validation of the adjusted Diagnostic Category Weight. The total study cohort was randomly divided into a derivation group and a validation group with identical sample sizes. The first one was used to calculate the adjusted Diagnostic Category Weight and the second one was used for its validation using two different approaches. APACHE, Acute Physiology and Chronic Health Evaluation.

Parameter	Apache II score mean + SEM; (n)	Survivors’ length of hospital stay [thosp]/ d mean + SEM; (n)	Mortality at survivors’ mean hospital stay / % $\widehat{S}\left(t_{\mathit{hosp}}\right)$ ± SE($t_{\mathit{hosp}})$; (n)	Predicted Mortality by Apache II score / % mean + SEM; (n)	Adjusted Diagnostic Category Weight
Derivation	33.7 ± 0.8; (90)	22.6 ± 2.6; (34)	57.8 ± 5.2; (90)	74.8 ± 2.3; (90)	−1,089
Validation	33.3 ± 0.8; (90)	23.2 ± 2.2; (37)	51.1 ± 5.3; (90)	55.8 ± 2.4; (90)