Table 1. Clinical and behavioral characteristics.

	HCs			IBS subjects			UC subjects			F	Sig.
	N	Mean	SD	N	Mean	SD	N	Mean	SD
Sex (Male/Female)	16/25			2/9			10/6
Age	41	28.17	8.43	11	31.55	9.49	16	28.56	8.95	.66	.52
Anxiety symptoms1	41	2.8	2.33	11	6.91	3.67	16	7.31	3.55	18.29	<.01
Depression symptoms1	41	.85	1.22	11	2.64	2.73	16	3.44	3.54	7.77	<.01
Visceral Sensitivity Index 2	40	2.83	5.17	11	37.45	12.94	15	26.13	14.09	61.68	<.01
Overall Bowel Symptoms3				11	11.91	2.74	13	4.69	2.46	54.12	<.01
Abdominal Pain4				11	10.55	4.3	14	4.14	3.61	18.01	<.01
Abdominal Discomfort5				11	11.91	4.21	16	4.06	3.86	49.63	<.01
Duration of symptoms6				10	8.5	6.13	16	9.81	9.35	1.67	.69

F =  main effect of group from ANOVA and t-tests for four and two group comparisons, respectively.

1. HAD: Hospital Anxiety and Depression [25];

2. VSI: Visceral Sensitivity Index [26], [27];

BSQ: Bowel Symptom Questionnaire [24].

3. BSQ Overall Symptoms in the Past week (0–20).

4. BSQ Abdominal Pain in the Past week (0–20).

5. BSQ Discomfort in the Past week (0–20).

6. BSQ Duration in years, derived from onset of symptom.

Statistically significant p<0.05.