Current cases of a specified condition or disease in a defined age group. Includes cases that have migrated in, but excludes those who have died or migrated out. It provides an estimate of the probability (P, risk) that an individual will be ill at that point in time, with the total relevant population as the denominator. Thus: P = number of existing cases at a given time point/total population.
See Asperger’s syndrome, Birth prevalence, Cumulative incidence (CI), Epidemiology, Incidence, Internalising disorders/ Likelihood ratio (LR), Neuronal migration disorders, Oppositional defiant disorder (ODD), Otitis media with effusion (OME)