Figure 1From: Co-occurrence of IBS and symptoms of anxiety or depression, among Norwegian twins, is influenced by both heredity and intrauterine growthSymptoms of anxiety among MZ twins discordant for IBS. The assoiation between IBS and symptoms of anxiety among MZ twins was demonstrated only in the birth weight groups < 2500 g, indicating restricted fetal growth as a common contributing factor in the low range of birth weight.Back to article page