12.2  Assessing the quality of a body of evidence

12.2.1 The GRADE approach

Table 12.2.a Levels of quality of a body of evidence in the GRADE approach

Table 12.2.b Factors that may decrease the quality level of a body of evidence

Table 12.2.c Factors that may increase the quality level of a body of evidence

12.2.2 Factors that decrease the quality level of a body of evidence

Table 12.2.d Further guidelines for factor 1 (of 5) in a GRADE assessment: Going from assessments of risk of bias to judgements about study limitations for main outcomes

12.2.3 Factors that increase the quality level of a body of evidence