Table 1 Showing statements of evidence
From: The conundrum of guidelines, recommendations, and strength of recommendation
| Statements of evidence | |
|---|---|
| Ia | Evidence obtained from meta-analysis of RCTs |
| Ib | Evidence obtained from at least 1 RCT |
| IIa | Evidence obtained from at least 1 well-designed controlled study without randomization |
| IIb | Evidence obtained from at least 1 other type of well-designed quasi-experimental study |
| III | Evidence obtained from well-designed non-experimental descriptive studies, such as comparative studies, correlation studies, and case reports |
| IV | Evidence obtained from expert committee reports or opinions and/or clinical experiences of respected authorities |
