<prompt> Following can be used as a yardstick for the assessment of standards of therapy -Specific death rateCase fatality rateProportional mortality rateSurvival rate  <response>: Survival rate It is the proportion of survivors in a group e.g. of patients studied and followed over a period of time.It is a method of describing prognosis in certain disease conditions.Survival experience can used as a yardstick for the assessment of standard of therapy.Survival rates have received special attention in cancer studies.5 years of survival rate Total no. of patients alive after 5 years Total no. of patients diagnosed or treated x 100Survival period is usually reckoned from the date of diagnosis or start of the treatment. 