The autism spectrum encompasses a range of neurodevelopmental conditions, including autism and Asperger syndrome, generally known as autism spectrum disorders (ASD). Individuals on the autistic spectrum experience difficulties with social communication and interaction and also exhibit restricted, repetitive patterns of behavior, interests, or activities. Symptoms are typically recognized between one and two years of age. However, a lot of children are not finally diagnosed until they are older. Final diagnosis could still be given as an adolescent or even as an adult. The term "spectrum" refers to the variation in the type and severity of symptoms. Those in the mild range may function independently, while those with moderate to severe symptoms may require more substantial support in their daily lives. Long-term problems may include difficulties in performing daily tasks, creating and keeping relationships, and maintaining a job.The cause of autism spectrum conditions is uncertain. Risk factors include having an older parent, a family history of autism, and certain genetic conditions. It is estimated that between 64% and 91% of risk is due to family history. Diagnosis is based on symptoms. In 2013, the Diagnostic and Statistical Manual of Mental Disorders version 5 (DSM-5) replaced the previous subgroups of autistic disorder, Asperger syndrome, pervasive developmental disorder not otherwise specified (PDD-NOS), and childhood disintegrative disorder with the single term "autism spectrum disorder".Treatment efforts are generally individualized and can include behavioural therapy and the teaching of coping skills. Medications may be used to try to help improve symptoms. Evidence to support the use of medications, however, is not very strong.An estimated 1% of the population (62.2 million globally) are on the autism spectrum as of 2015. In the United States it is estimated to affect more than 2% of children (about 1.5 million) as of 2016. Males are diagnosed four times more often than females. The autism rights movement promotes the concept of neurodiversity, which views autism as a natural variation of the brain rather than a disorder to be cured.