Which of the following is not true about non-randomized trials?

A. Approach of comparability is high

B. Degree of comparability is high

C. The experiment can serve as its own control or can utilize a natural control

D. Several trials may be needed before evaluation is considered conclusive

Correct Answer: Degree of comparability is high

Description: Non-randomized trials ( i.e. Those depaing from strict randomization for practical purposes but in such a manner that non-randomization does not seriously affect the theoretical basis of conclusions ( refer pg 81, park 23 rd edition)

Category: Social & Preventive Medicine

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