Editorial

Abstract

Nowadays, clinical practice guideline (CPG) is booming in Thailand. Some of the most important factors in CPG developing are classification of evidence levels and grading of recommendations. Evidence obtained from meta- analysis of randomized controlled trials (RCT) (Ia) or at least one RCT (Ib) were graded as A, while those from expert committee reports or opinions and/or clinical experience of respected authorities were graded as D. This classification and grading are worldwidely accepted in modern medicine, including Thailand.