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Table 2 Risk of bias assessment

From: Intention-to-treat analysis may be more conservative than per protocol analysis in antibiotic non-inferiority trials: a systematic review

  All comparisons within studies (N = 164)
Randomization
 High risk 3 (1.8%)
 Low risk 110 (67.1%)
 Unclear 51 (31.1%)
Allocation concealment
 High risk 3 (1.8%)
 Low risk 74 (45.1%)
 Unclear 87 (53.1%)
Performance bias
 High risk 75 (45.7%)
 Low risk 84 (51.2%)
 Unclear 5 (3.1%)
Detection bias
 High risk 58 (35.4%)
 Low risk 100 (61.0%)
 Unclear 6 (3.7%)
Attrition bias
 High risk 51 (31.1%)
 Low risk 108 (65.9%)
 Unclear 5 (3.1%)
Reporting bias
 High risk 28 (17.1%)
 Low risk 136 (82.9%)
 Unclear 0 (0%)