Table 1. Observed and Predicted Mortality and New Functional Morbidity in RACHS and STAT Categories.

Both observed and predicted mortality and functional morbidity rates increased with increasing severity categories for both systems (both p < 0.0001 Predicted new functional morbidity rates also increased with increasing severity categories (RACHS: p=0.0032; STAT: p=0.0009).

RACHS	N	Median Age (Months)	Crude Mortality N (%)	Predicted Mortality N (%)	Mortality SMR (95% CI)	Crude New Morbidity N (%)	Predicted Morbidity N (%)	Morbidity SMR (95% CI)
1	114	55	0 (0.0%)	0.7 (0.6%)	0 (NA-5.3)	2 (1.8%)	2.9 (2.5%)	0.7 (0.1–2.5)
2	585	6	10 (1.7%)	9.2 (1.6%)	1.1 (0.5–2.0)	15 (2.6%)	21.7 (3.7%)	0.7 (0.4–1.1)
3	517	9	17 (3.3%)	16.2 (3.1%)	1.1 (0.6–1.7)	24 (4.6%)	24.1 (4.7%)	1.0 (0.6–1.5)
4	149	0	8 (5.4%)	11.5 (7.7%)	0.7 (0.3–1.4)	15 (10.1%)	10.5 (7.1%)	1.4 (0.8–2.4)
5	3	0	0 (0.0%)	0.3 (11.2%)	0 (NA-10.9)	0 (0.0%)	0.3 (9.7%)	0 (NA-12.2)
6	79	0	9 (11.4%)	10.4 (13.1%)	0.9 (0.4–1.7)	11 (13.9%)	7.7 (9.7%)	1.4 (0.7–2.6)
Unable to classify	103	69	6 (5.8%)	1.5 (1.5%)	3.9 (1.4–8.5)	7 (6.8%)	3.8 (3.7%)	1.9 (0.7–3.8)
STAT
1	423	28	2 (0.5%)	3.8 (0.9%)	0.5 (0.1–1.9)	7 (1.7%)	12.7 (3.0%)	0.5 (0.2–1.1)
2	513	15	10 (1.9%)	8.2 (1.6%)	1.2 (0.6–2.2)	11 (2.1%)	18.5 (3.6%)	0.6 (0.3–1.1)
3	205	5	6 (2.9%)	6 (2.9%)	1.0 (0.4–2.2)	11 (5.4%)	9.7 (4.7%)	1.1 (0.6–2.0)
4	308	0	21 (6.8%)	20.6 (6.7%)	1.0 (0.6–1.6)	31 (10.1%)	21.1 (6.9%)	1.5 (0.99–2.1)
5	85	0	9 (10.6%)	10.7 (12.6%)	0.8 (0.4–1.6)	11 (12.9%)	8.1 (9.5%)	1.4 (0.7–2.4)
Unable to classify	16	40	2 (12.5%)	0.5 (2.8%)	4.4 (0.5–15.8)	3 (18.8%)	0.8 (5.2%)	3.6 (0.7–10.6)

Abbreviations: SMR = Standardized Morbidity/Mortality Ratio