Data abstraction

In general, the studies included in systematic reviews are reviewed by at least two reviewers. Data such as numbers of people entered into studies, numbers lost to follow up, effects sizes and quality criteria are recorded on predesigned data abstraction forms by at least two reviewers. Differences between reviewers are usually settled by consensus or by a third arbitrator. A systematic review in which there are large areas of disagreement between reviewers should lead the reader to question the validity of the review.

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