TABLE 3.

Items Selected From the Eating Disorder Examination Questionnaire for a Case-Predicting Questionnaire^a and Their Association With the Development of an Eating Disorder

	Rate of Development of Eating Disorders
Item and Optimal Cut Point for Signal Detection Analysis		Subjects With an Eating Disorder		Analysis
	N	N	%	χ 2	df	p
Objective bulimic episodes				38.26	1	<0.001
<3 episodes/28 days	2,325	63	2.7
≥3 episodes/28 days	333	32	9.6
Laxative misuse/self-induced vomiting				31.23	1	<0.001
<2 episodes/28 days	2,827	95	3.4
≥2 episodes/28 days	36	8	22.2
Body mass index (kg/m2)				25.26	1	<0.001
≥19	2,628	81	3.1
<19	180	19	10.6
Secret eating				33.50	1	<0.001
<13 instances/28 days	2,742	86	3.1
≥13 instances/28 days	128	17	13.3
Fear of losing control over eating				24.70	1	<0.001
<23 instances/28 days	2,454	70	2.9
≥23 instances/28 days	419	33	7.9
Desire to have an empty stomach				18.93	1	<0.001
<16 instances/28 days	2,254	62	2.8
≥16 instances/28 days	613	40	6.5
Preoccupation with fooda				21.92	1	<0.001
<6 instances/28 days	2,256	61	2.7
≥6 instances/28 days	623	42	6.7
Preoccupation with shape or weighta				21.11	1	<0.001
<13 instances/28 days	2,367	67	2.8
≥13 instances/28 days	503	36	7.1
Total of previous items				91.61b	1	<0.001
0	1,479	22	1.5
1	686	18	2.6
2	357	19	5.3
3	217	22	10.1
4	123	15	12.1
≥5	55	8	14.5

^aSelected for signal detection analysis only.

^bLinear trend.