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Items: 3


Randomized, controlled trials, observational studies, and the hierarchy of research designs.

Concato J, Shah N, Horwitz RI.

N Engl J Med. 2000 Jun 22;342(25):1887-92.


A comparison of observational studies and randomized, controlled trials.

Benson K, Hartz AJ.

N Engl J Med. 2000 Jun 22;342(25):1878-86.


Choosing between randomised and non-randomised studies: a systematic review.

Britton A, McKee M, Black N, McPherson K, Sanderson C, Bain C.

Health Technol Assess. 1998;2(13):i-iv, 1-124. Review. No abstract available.

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