<prompt> Prevalence is calculated by formula2018Incidence x Mean durationx100Incidence Mean duration x 100IncidenceMean durationIncidence x Mean duration  <response>: 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 