age of onset
1 Multiple sclerosis is more common in individuals of northern European descent. 2  Women are more than twice as likely to develop multiple sclerosis as men.  Multiple sclerosis usually affects people between the ages of 20 and 50 years, and the average age of onset is approximately 34 years. n the period of time a person has existed or an object has existed. age, biological, n the age determined by physiology rather than chronology. Factors include changes in the physical structure of the body as well as changes in the performance of motor skills and sensory awareness. The demographic questionnaire consisted of 16 items that were designed to obtain the participants' demographic information, such as age, gender, race, employment status, relationship status, and disability characteristics (including visual acuity, visual field restriction, and age of onset of the disability). To be diagnosed with bipolar illness, a person has to have had at least one episode of mania or hypomania. The Diagnostic and Statistical Manual of Mental Disorders (DSM) defines four types of bipolar illness: Bipolar I Disorder is an illness in which people have experienced one or more episodes of mania. This neural system works efficiently, unless there is a disease process affecting the pathways in the spinal cord and brain. Multiple sclerosis is one of the diseases that can affect these pathways. Signals are transmitted within the central nervous system along pathways. chronological age the measure of time elapsed since a person's birth. fertilization age the age of a conceptus defined by the time elapsed since fertilization. gestational age the age of a conceptus or pregnancy; in human clinical practice, timed from onset of the last normal menstrual period. Elsewhere the onset may be timed from estrus, coitus, artificial insemination, vaginal plug formation, fertilization, or implantation. They may also have extreme pleasure-seeking or risk-taking behaviors. People’s symptoms and the severity of their mania or depression vary widely. Although bipolar disorder can occur at any point in life, the average age of onset is 25. Every year, 2.9% of the U.S. population is diagnosed with bipolar disorder, with nearly 83% of cases being classified as severe. Bipolar disorder affects men and women equally. 1 Women are more than twice as likely to develop multiple sclerosis as men.  Multiple sclerosis usually affects people between the ages of 20 and 50 years, and the average age of onset is approximately 34 years. Freebase(0.00 / 0 votes)Rate this definition: Age of onset. The age of onset is a medical term referring to the age at which an individual acquires, develops, or first experiences a condition or symptoms of a disease or disorder. 1 This autoimmune destruction of the myelin sheath leads to areas of demyelination (also known as plaques) in the brain and spinal cord.  These plaques disrupt the transmission of information in the CNS and lead to the symptoms seen in multiple sclerosis.
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