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Table 1 Risk of bias judgement for sequence generation of randomised trials in Cochrane and non-Cochrane reviews

From: Risk of bias assessment of sequence generation: a study of 100 systematic reviews of trials

Sequence generation ROB judgement of randomised trials

High ROB

Low ROB

Unclear ROB

Cochrane reviewsa

8 (0.8%)

462 (47.0%)

514 (52.2%)

Non-Cochrane review using Cochrane ROB toolb

80 (5.8%)

751 (54.6%)

545 (39.6%)

  1. aSixty-four reviews, including 984 randomised trials
  2. bThirty-six reviews, including 1376 studies; one review is awaiting classification and contains an additional 35 randomised trials