<prompt> In a study with new treatment, there were reported 36 deathtreatment failures out of sample of 120.With a new treatment, 26 treatment failure were reported from a sample size of 130. How many patients should be treated to avert 1 death?10010250160  <response>: Ans. b 10Ref: Parks Text book of Preventive and Social Medicine 24th Ed; Page No- 856There are three steps required to solve this type Number needed to treat of MCQ.According to the Question:Experimental group 26 Rx failure 130 sampleControl previous treatment group 36 Rx failure 120 sample Step-1: Make a box Events occursNo Events Experimental Gp26104130Control Gp3684120 Step-2: Calculate the Event rate Event rate in experimental Gp Or Experimental Event rate EER 261300.2 Event Rate in Control Group or Control Event Rate CER 361200.3 Step-3: Absolute Risk Reduction ARR CER-EER 0.3-0.20.1 Number Needed to Treat 1ARR 10.110 