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Incidence of NRBCs in blood in medical intensive care patients in relation to the APACHE II and the SAPS II
| Risk model | Score range of risk model | Incidence of NRBCs |
| APACHE II | < 11 | 4.7% (6/127) |
| 11–20 | 18.4% (28/152) | |
| 21–30 | 30.6% (22/72) | |
| > 30 | 34.4% (11/32) | |
| SAPS II | < 21 | 5.6% (4/71) |
| 21–40 | 13.3% (27/203) | |
| 41–60 | 34.3% (23/67) | |
| > 60 | 30.9% (13/42) |
APACHE II, Acute Physiology and Chronic Health Evaluation II; NRBC, nucleated red blood cell; SAPS II, Simplified Acute Physiology Score II.
