<prompt> Which of the following is true about incidence?Used for chronic conditionsMeasures old new casesMore than prevalenceNot affected by duration  <response>: INCIDENCE Incidence rate is defined as the number of NEW cases occurring in a defined population during a specified period of time. It will be seen from the above definition that incidence rate refers a. only to new cases b. during a given period usually one year c. in a specified population or population at risk, unless other denominators are chosen. d. it can also refer to new spells or episodes of disease arising in a given period of time, per 1000 population. Ref : Park 23rd edition Pgno : 59 