RESUMO
Over a 2-year period, 144 omani mentally retarded patients were assessed. A questionnaire was utilized to obtain demographic data and details of significance such as consanguinity, family history, medical history, developmental milestones, self help abilities and schooling. The vineland social maturity scale and the Stanford binet intelligence scale was used to assess the patients. Majority of the patient were from the Muscat region, followed by Batinah, Dakhliya, Sharqiya, Dhofar and Dhahira. There were no patients from wustah and musandam. A large proportion [50.69%] of the patients had consanguineous parents and 21.52% of the patients had a family history of mental retardation. Unhealthy pregnancies [14.58%] and a significant medical history [57.63%] was evident. Developmental delay and speech problems [81.94%] were present. A proportion of the patients revealed that 13.88% of the patients were in the category of mild MR; 35.41% were in the category of moderate MR and 18.75% in the category of severe MR. There is a need to gauge mental retardation in oman by large systematic epidemiological studies followed by systematic prevention work