<prompt> Most impoant factor which decides the results of a randomized controlled trial is: March 2005Inclusion of all age groups50 treated with placebo and 50 with drugs100 follow upEffective randomization  <response>: Ans. D: Effective randomization It is a procedure by which the paicipants are allocated into groups usually called study and control groups. Randomization is the hea of control trials. It eliminates selection bias 