Table 2.

- Grading of Recommendations Assessment Development and Evaluation (GRADE) system used in the Clinical Practice Guidelines for Liver Transplantation in Saudi Arabia.

GRADE evidence
I	Randomized, controlled trials
II-1	Controlled trials without randomization
II-2	Cohort or case-control analytic studies
II-3	Multiple time series, dramatic uncontrolled experiments
III	Opinions of respected authorities, descriptive epidemiology