Anxiety symptoms across the lifespan in people diagnosed with Autistic Disorder

Symptoms of psychiatric disorders have been found to co-occur at high rates in those diagnosed with Autistic Disorder (AD). However, to date, no study has yet examined the developmental trajectory of comorbid psychiatric symptoms across the lifespan within the AD population. Therefore, the purpose of this study was to conduct a cross-sectional investigation of symptoms of anxiety across the lifespan, using a sample of individuals diagnosed with AD. This study utilizes a sample with an age range from infancy to adulthood. Endorsement rates of overlapping anxiety symptoms from measures that have been found reliable and valid for the specific purpose of examining psychiatric symptoms within the AD population are utilized for this study. Results indicate that there is a significant difference between different age cohorts on symptom endorsements of anxiety. Additionally, a cubic trend was found when examining the pattern of anxiety symptoms across the lifespan in those diagnosed with AD. That is, anxiety rises from toddlerhood to childhood, decreases from childhood to young adulthood, but again increases from young adulthood into older adulthood. Implications of these findings, limitations of this study, and future directions for research are discussed.