Revising the probability estimates of organic and non-organic disease categories using category-oriented likelihood ratios in approach to patients complaining of non-acute abdominal pain*. * Category-oriented likelihood ratios of the key clinical findings and the probabilities calculated using relevant values derived from the result of a study by Muris et al. . ** Key clinical findings in this example are: male gender, age > 60 years, history of blood in stool, pain affecting sleep, no pain relief after defecation, no specific character of pain, weight loss > 1 kg in 4 weeks, white blood cell count > 10,000 mm-3, erythrocyte sedimentation rate > 20 mm per hour, low hemoglobin level. § Arrows show the revising of the pre-test probability estimates to the post-test probability estimates.