International Journal of Thyroidology

Table. 1.

Table. 1.

Definition of recommendation levels

Recommendation level Definition
A When there is a clear rationale for the recommendations:When manifold randomized controlled trials that can be generalized because they have sufficient test or meta-analysis results support a recommendation.
B When there is a reliable basis for the recommendations:When reasonable grounds support this through well-performed cohort studies or patient—control group studies.
C When there is a possible basis for the recommendations:When relevant grounds are seen through randomized clinical studies or case reports and observational studies carried out in a small institution, despite their inherent unreliability.
E Expert recommendations:There is no basis to support the recommendations, but they are supported by expert opinion or expert clinical experience.
Int J Thyroidol 2022;15:1-16 https://doi.org/10.11106/ijt.2022.15.1.1
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