The proportion of new cases of the target disorder in the population at risk during a specified time interval. It is usual to define the disorder, and the population, and the time, and report the incidence as a rate. For some examples of incidence studies, two of the best relate to how Parkinson's disease incidence varies with latitude, and how Perthes' disease a developmental problem of the hip joint affecting younger children varies with deprivation. A summary of the medical literature that uses explicit methods to perform a thorough literature search and critical appraisal of individual studies and that uses appropriate statistical techniques to combine these valid studies. Systematic reviews are not all equal, and quality issues are important.
Attention-deficit hyperactivity disorder ADHD can't be diagnosed with a physical test, like a blood test or an X-ray. During the evaluation, a professional gathers information about you or your child to determine if the criteria for ADHD are met. Regardless of the specific presentation of ADHD—inattentive, hyperactive-impulsive, or combined—several conditions must be met in order to arrive at an official diagnosis:. For children up to 16 years old, six or more symptoms of inattention must be present, while people 17 and older must exhibit five or more symptoms.
ATUL T. OGLE, M. See related patient information handout on acute low back pain , prepared by Courtney Brooks, a medical editing clerkship student at Georgetown University Medical Center. Acute low back pain is commonly encountered in primary care practice but the specific cause often cannot be identified. This ailment has a benign course in 90 percent of patients.