Introduction: The Adult Neurodevelopmental Service in Singapore is the first service of its kind in South-East Asia for adults with intellectual disability (ID) and/or autism spectrum disorder (ASD). However, few studies have documented and compared the sociodemographic characteristics and clinical needs of this subpopulation group.Methods: Initial assessments conducted from 1 January 2015 to 31 December 2016 were retrospectively reviewed for this descriptive study.Results: A total of 272 patients were included in the study (mean age 28.3 ± 11.5; 200 males, 72 females). Adults with ID comprised the largest percentage (52.9%), followed by those with ASD (30.2%), and then those with cooccurring ASD and ID (16.9%). The ASD subgroup had the highest proportion of individuals with employment, postsecondary school education, functional capabilities, and a psychiatric disorder. In comparison, adults with only ID and adults with co-occurring ASD and ID shared similar lower levels of education and employment, and had a higher proportion of individuals with epilepsy and aggressive behavior.Discussion: In this study, adults with ASD had a unique social profile with different clinical needs compared to adults with only ID or to adults with co-occurring ASD and ID. Adults with only ID and those with co-occurring ASD shared many of the same social characteristics and high clinical needs. The analysis of these profiles will be useful in developing services that better meet the needs of this complex group. K E Y W O R D S adult, autism spectrum disorder, intellectual disability, mental retardation, neurodevelopmental disorder

AimsTo describe the occurrence of medical comorbity in patients with neurodevelopmental disorders presenting to the Adult Neurodevelopmental Service (ANDS) multi-disciplinary new case clinic at the Institute of Mental Health (IMH) in Singapore. We hypothesize that patients with neurodevelopmental disorders have higher rates of medical comorbidity compared to those without a diagnosis of neurodevelopmental disorder.BackgroundMedical comorbidities are common in patients with neurodevelopmental disorders. They may have difficulties managing their medical conditions which could in turn affect their well being, quality of life and life expectancy.MethodA retrospective cohort study was conducted amongst patients who presented to the clinic from January 2015 to December 2016. The electronic case records of the assessments were de-identified and the medical conditions of patients were collected and analysed.Result319 patients attended the ANDS new case clinic in the 2-year study period. 87.1% (278/319) were diagnosed with a neurodevelopmental disorder while 12.9% (41/319) did not receive any diagnosis of a neurodevelopmental disorder.58.3% (162/278) of patients with a neurodevelopmental disorder had at least 1 medical comorbidity while only 31.7% (13/41) of patients with no neurodevelopmental disorder had at least 1 medical condition.Patients with neurodevelopmental disorders had higher rates of epilepsy (12.2% vs 4.9%), cerebral palsy (3.2% vs 0%) but lower rates of having other neurological conditions (1.4% vs 7.3%) compared to those with no neurodevelopmental disorders.Patients with neurodevelopmental disorders had higher rates of diabetes (6.1% vs 2.4%), hypertension (6.1% vs 2.4%), hyperlipidaemia (7.1% vs 2.4%) and cardiovascular conditions (2.9% vs 0%) than those without a neurodevelopmental disorder.In terms of other medical comorbidities, patients with neurodevelopmental disorders had higher rates of thyroid abnormalities (4.7% vs 2.4%), respiratory problems (7.6% vs 2.4%), musculoskeletal conditions (5.8% vs 0%), eye issues (5% vs 2.4%) and hearing problems (2.9% vs 0%) but similar rates of dermatological conditions (10.1% vs 9.8%) and gastrointestinal conditions (4.7% vs 4.9%) compared to those with no neurodevelopmental disorders.ConclusionPatients with neurodevelopmental disorders have significantly highly rates of medical comorbidity than those without any neurodevelopmental disorders. This study highlights the need to raise awareness of the common medical comorbidities in patients with neurodevelopmental disorders and to ensure adequate screening and referral for follow-up medical care for them.