In a stable situation-: (A) Incidence = prevalence x duration, (B) Prevalence = Incidence x Duration, (C) Incidence = Prevalence + Duration, (D) Prevalence = Incidence + Duration
Answer is B. prevalence refers specifically to all current cases existing at agiven point in time ,or over a period of time in a given population. Prevalence depends on 2 factors,incidence and duration of disease. Given assumption that the population is stable,and incidence and duration are unchanging ,the relationship between incidence and prevalence can be expressed as P=I*D = incidence *mean duration. Parks textbook of preventive and social medicine.K Park. Edition 23.Pg no: 61