Non – bias study is –
Correct Answer: Randomized controlled trials
Description: .<p>randomised control trials mainly include dtrawing up a protocol,selecting reference and experimental populations ,randomisation,manipulation or intervention ,follow up, assessment of outcome.RCT s are generally described as non biassed studies as they give no chance of any systemic error in the determination of association between exposure and disease.</p><p>ref:park&;s textbook of preventive and social medicine,22 nd edition ,pg no 70</p>
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