Incidence is an epidemiological term, which means the number of new cases of a diseaese occurring in a defined population in a defined period of time. Incidence can be calculated by either following a defined population over a longer period of time or if the prevalene of a disease and its average duration is known. Since in Pakistan neither the catchment population of hospitals is defined, nor is there a proper referral system, prevalence and incidene of any diseas cannot be calculated from hospital studies in Pakistan. All we can get is the proportion or frequency of various disease.
Posted by: rehan - Mar 2002