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Data were analyzed with regression and cluster analysis.<\/jats:p><\/jats:sec><jats:sec id=\"S0924933800259543_abs3\" sec-type=\"results\"><jats:title>Results.<\/jats:title><jats:p>Lower age at onset was associated with a higher probability of having comorbidity with tic, anxiety, somatoform, eating and impulse\u2013control disorders. Longer illness duration was associated with lower chance of having tics. Female gender was associated with anxiety, eating and impulse\u2013control disorders. Tic disorders were associated with anxiety disorders and attention-deficit\/hyperactivity disorder. No cut-off age at onset was found to clearly divide the sample in homogeneous subgroups. However, cluster analyses revealed that differences started to emerge at the age of 10 and were more pronounced at the age of 17, suggesting that these were the best cut-off points on this sample.<\/jats:p><\/jats:sec><jats:sec id=\"S0924933800259543_abs4\" sec-type=\"conclusions\"><jats:title>Conclusions.<\/jats:title><jats:p>Age at onset is associated with specific comorbidity patterns in OCD patients. 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