Table 2.

Base rates and diagnostic efficiency indices for DSM-IV behavioral criteria for binge eating analyzed separately for BED (N=164), BN (N=83), and BED+BN (N=247) groups.

Variable Criterion	BR	Sens	Spec	PPP	NPP	TPV	Kappa
BED versus comparison group Base rate of BED diagnosis = .18
Eating much more rapidly than usual	.24	.52	.83	.43	.88	.77	.33
Eating until uncomfortably full	.26	.63	.84	.49	.90	.80	.42
Eating large amounts when not physically hungry	.23	.66	.88	.57	.91	.84	.51
Eating alone because embarrassed	.11	.40	.96	.71	.87	.85	.44
Feeling disgusted, depressed, or guilty afterward	.32	.80	.80	.49	.94	.80	.48
BN versus comparison group Base rate of BN diagnosis = .09
Eating much more rapidly than usual	.21	.52	.83	.27	.93	.79	.25
Eating until uncomfortably full	.22	.67	.84	.34	.95	.82	.36
Eating large amounts when not physically hungry	.18	.69	.88	.42	.96	.86	.44
Eating alone because embarrassed	.09	.54	.96	.62	.95	.91	.53
Feeling disgusted, depressed, or guilty afterward	.28	.93	.80	.36	.99	.81	.42
BED+BN versus comparison group Base rate of combined diagnoses = .27
Eating much more rapidly than usual	.27	.52	.83	.53	.82	.75	.35
Eating until uncomfortably full	.29	.64	.84	.59	.86	.78	.47
Eating large amounts when not physically hungry	.27	.67	.88	.67	.88	.82	.55
Eating alone because embarrassed	.15	.45	.96	.80	.83	.82	.48
Feeling disgusted, depressed, or guilty afterward	.38	.84	.80	.60	.93	.81	.57

Note. BN and BED classification was determined by binge eating and/or purging at a frequency of once per week or more for the previous 28 days.

Note. BED = binge eating disorder; BN = bulimia nervosa; sens = sensivity; spec = specificity; PPP = positive predictive power; NPP = negative predictive power; TPV = total predictive value.

All kappa coefficient values are significant at p<.001.