Compared with the general UK population, adults with Asperger’s syndrome are much more likely to experience suicidal thoughts and plan or attempt suicide, a clinical cohort study has found. Asperger’s syndrome was diagnosed by an expert clinician, using the Adult Asperger Assessment and clinical judgement. Over a nine-year period, 374 adults (256 men and 118 women) were diagnosed with Asperger’s syndrome, of whom 367 completed the questionnaire.