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Distribution of subjects with and without irritable bowel syndrome (IBS) according to the Somatic Symptom Checklist (SSC) and the Global Severity Index (GSI) of SCL-90-R. * 0.18 Is the 25th percentile of SSC distribution; ‡ 0.77 Is the 75th percentile of SSC distribution; † GGSI scores were transformed into standardized T scores with a mean of 50 and s.d. of 10.
