<prompt> Which one of the following is not a special incidence rateAttack rateSecondary attack rateHospital admission ratestandardized moality rate  <response>: ref: Parks 23rd edition pg 58 All except D are special incidence rate. Standardised moality rate is adjusted moality rate, which removes the confounding effect of different age structures and yields a single standardised or adjusted rate by which moality experience can be directly compared. 