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Table 1 Number of twin pairs and cases for each disorder by zygosity in a Norwegian population-based cohort

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

Groups

Pairs

Cases of irritable bowel syndrome

Cases of depression

Cases of anxiety

Monozygotic

1250

123

336

298

Dizygotic

1946

213

619

532

Total

3196

336

985

830