<prompt> All are true about incidence, except-Numerator includes new casesDenominator includes population at riskDoes not include population at riskIt is a rate  <response>: .incidence rate is defin ed as the number of new case occurring in a defined population during a specified period of time.it will be seen from the above definition that incidence rate refers only to new cases,and during a given period usually assumed as one year.it also refers in a specified population or ;population at riskunless other denominators are chosen.ref:park;s textbook of preventive and social medicine,22 nd edition,pg no 58 