Table 1.

Characteristics of participants

	Total	IBS	IBSD	IBSC	Control
N	1087	206	61	45	881
Male/Female	506/576	88/116	39/22	10/34	418/460
Age	19.72 ± 1.76	19.53 ± 1.87	19.90 ± 2.19	19.39 ± 1.43	19.77 ± 1.73