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. Author manuscript; available in PMC: 2011 Sep 1.

Published in final edited form as: Am J Emerg Med. 2010 Mar 25;28(7):803–808. doi: 10.1016/j.ajem.2009.04.009

Table 2.

Admission rates by risk group in the derivation and validation cohorts, based on the classification tree.

Risk Group	Derivation Cohort (n=1,825)	Validation Cohort (n=1,335)

	Admission no./Total no. (%)	Admission no./Total no. (%)
Group 1	84/957 (9)	55/488 (11)
Group 2	11/97 (11)	5/75 (7)
Group 3	12/92 (12)	27/117 (23)
Group 4	50/195 (26)	49/223 (22)
Group 5	44/171 (26)	30/70 (43)
Group 6	20/73 (27)	14/65 (22)
Group 7	114/240 (48)	96/297 (32)
P_trend	<0.001	<0.001
Area under the ROC curve	0.72	0.65

Abbreviations: ROC, receiver operating characteristic.