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Table 1 Risk of bias and number of participants for the included trials

From: Tolerating bad health research: the continuing scandal

  High Unclear Low No RoB
Number of trials
(total = 1659; % based on 1640 trials with risk of bias information)
1013 (62%) 494 (30%) 133 (8%) 19
Number of participants
(total = 398,410)
222,850 (55.93%) 127,290 (31.95%) 47,138 (11.83%) 1132 (0.28%)