Ans: C. Newer and effective treatment modalities decrease the incidenceRef: Park 24Ic p67, 23Ie p62, 22/c p59).Newer and effective treatment modalities do not decrease the incidence.Improvements in treatment may decrease the duration of illness and may decrease prevalence.Relation between Incidence & PrevalenceGiven the assumption that population is stable & incidence and duration are not changing.Prevalence = Incidence x Mean duration of diseasePrevalence describes balance between incidence, moality & recoverye.Incidence reflects causal factorse.Duration reflects prognostic factorse
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