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. 2002 Mar 13;6(2):166–174. doi: 10.1186/cc1477

Table 2.

Mortalities predicted by the four systems

System	N	Actual mortality	Predicted mortality	SMR	95% CI	Survivors	Non-survivors
MPM II₀	969	0.320	0.319	1.00	0.91–1.10	0.190 ± 0.205	0.592 ± 0.307^*
MPM II₂₄	681	0.316	0.341	0.92	0.82–1.03	0.221 ± 0.220	0.602 ± 0.290^*
APACHE II	681	0.316	0.315	1.00	0.89–1.11	0.213 ± 0.211	0.536 ± 0.279^*
SAPS II	681	0.316	0.290	1.09	0.97–1.21	0.189 ± 0.215	0.507 ± 0.311^*

^*P < 0.001 for survivors versus non-survivors. CI, confidence interval.