Table 7

Areas under the receiver operating characteristic (ROC) curves for logistic regression and the growing cell structure (GCS) system for the test set of the Crohn's disease versus ulcerative colitis (UC) data set

	Logistic regression				GCS system		Human performance
	All variables	Forward conditional	Backward conditional	BSG selected	All variables	BSG selected	Initial diagnosis	Observer diagnosis
BSG, British Society of Gastroenterology; N/A, not applicable; SE, standard error.
Area under ROC curve	0.7564	0.7596	0.7812	0.7771	0.7202	0.7334	N/A	N/A
SE of area under ROC curve	0.0464	0.0460	0.0437	0.0442	0.0466	0.0465	N/A	N/A
Sensitivity for UC	84%	63%	69%	67%	66%	74%	65%	61%
Specificity	62%	87%	78%	79%	66%	62%	98%	76%