Most impoant factor which decides the results of a randomized controlled trial is: March 2005: (A) Inclusion of all age groups, (B) 50% treated with placebo and 50% with drugs, (C) 100% follow up, (D) Effective randomization
Answer is D. 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