Prevalence is calculated by formula(2018): (A) Incidence x Mean durationx100, (B) Incidence/ Mean duration x 100, (C) Incidence/Mean duration, (D) Incidence x Mean duration
Answer is D. Relationship between prevalence and incidence Prevalence depends upon 2 factors, the incidence and duration of illness. Given the assumption that the population is stable, and incidence and duration are unchanging, the relationship between incidence and prevalence can be expressed as : P= IxD = incidence x mean duration Ref:- park; pg num:- 69