Co-occurrence of IBS and symptoms of anxiety or depression, among Norwegian twins, is influenced by both heredity and intrauterine growth

Table 2 Concordance rates and probandwise concordance rates for irritable bowel syndrome (IBS), depression and anxiety among monozygotic (MZ) and dizygotic (DZ) twins

		MZ	DZ	Total no pairs
IBS	Concordant pairs	14	10	24
	Discordant pairs	95	193	288
	Probandwise concordance rate	0.23	0.09*
Depression	Concordant pairs	67	82	149
	Discordant pairs	232	455	687
	Probandwise concordance rate	0.22	0.15*
Anxiety	Concordant pairs	56	55	111
	Discordant pairs	186	422	608
	Probandwise concordance rate	0.23	0.12*

ISSN: 1471-230X