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Primary Open-Angle Glaucoma

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Key Points Table 1. Recommendation Grading Study Ratings 1 I++ High-quality meta-analyses, systematic reviews of randomized controlled trials (RCTs), or RCTs with a very low risk of bias I+ Well-conducted meta-analyses, systematic reviews of RCTs, or RCTs with a low risk of bias I- Meta-analyses, systematic reviews of RCTs, or RCTs with a high risk of bias II++ High-quality systematic reviews of case-control or cohort studies High-quality case-control or cohort studies with a very low risk of confounding or bias and a high probability that the relationship is causal II+ Well-conducted case-control or cohort studies with a low risk of confounding or bias and a moderate probability that the relationship is causal II- Case-control or cohort studies with a high risk of confounding or bias and a significant risk that the relationship is not causal III Nonanalytic studies (e.g., case reports, case series) Evidence Ratings 2 G - Good quality Further research is very unlikely to change our confidence in the estimate of effect M - Moderate quality Further research is likely to have an important impact on our confidence in the estimate of effect and may change the estimate In - Insufficient quality Further research is very likely to have an important impact on our confidence in the estimate of effect and is likely to change the estimate Any estimate of effect is very uncertain Recommendation Ratings 3 S - Strong recommendation Used when the desirable effects of an intervention clearly outweigh the undesirable effects or clearly do not D - Discretionary recommendation Used when the trade-offs are less certain—either because of low- quality evidence or because evidence suggests that desirable and undesirable effects are closely balanced 1. To rate individual studies, a scale based on Scottish Intercollegiate Guideline Network (SIGN) is used. 2. The body of evidence quality ratings is defined by Grading of Recommendations Assessment, Development and Evaluation (GRADE). GRADE is a systematic approach to grading the strength of the total body of evidence that is available to support recommendations on a specific clinical management issue. 3. Key recommendations for care are defined by GRADE.

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