Randomization is best done by

C. i.e. (Random number table) (77 - Park 19th) (78- Park 20th)RANDOMIZATION - is a statistical procedure by which the participants are allocated into groups usually called "Study" and "Control" groups, to receive or not to receive an experimental preventive or therapeutic procedure, manoeuvre or intervention* Randomization is an attempt to eliminate "bias " and allow for comparability*** Randomization is done only after the participant has entered the study, that is after having been qualified for the trial and has given his informed consent to participate in the study* Randomization is best done by using a table of random numbers*** The major purpose of randomization clinical trials is to reduce selection bias in allocation of treatment**Basic step in Conducting a Randomized Controlled Trials(a) Drawing up a protocol(d) Manipulation or Intervention(b) Selecting reference and experimental population(e) Follow up(c) Randomization(f) Assessment of outcomeRandomization methods1. Simple randomization2. Block randomization3. Randomization based on prognostic factors4. Based on odd or even numbers - Least useful because leads to bias****In a controlled trial to compare two treatments. The main purpose of randomization is to ensure that - The two groups will be similar in prognostic factors**