Table 2 Categories of risk of bias
From: Influence of orthodontic treatment with fixed appliances on enamel color: a systematic review
Risk of bias | Interpretation | Within a study | Across studies |
|---|---|---|---|
Low risk of bias | Plausible bias unlikely to seriously alter the results | Low risk of bias for all key domains | Most information is from studies at low risk of bias |
Unclear risk of bias | Plausible bias that raises some doubt about the results | Unclear risk of bias for one or more key domains | Most information is from studies at low or unclear risk of bias |
High risk of bias | Plausible bias that seriously weakens confidence in the results | High risk of bias for one or more key domains | The proportion of information from studies at high risk of bias is sufficient to affect the interpretation of results |