Table 2. Strength of Evidence/Recommendation for the Audiology Algorithms
| Grade I: | Evidence is strong and usually obtained from randomized controlled trials or well-designed clinical studies. The recommendation is usually indicated and accepted, and is considered effective and useful. |
| Grade II: | Evidence is from clinical studies that were based on retrospective data analysis, clinical trials that were not randomized and/or carefully controlled, or from panel consensus based on existing guidelines and practice patterns. The recommendation is accepted and the weight of evidence supports its use and effectiveness. |
| Grade III: | Evidence is secondary in that it is based on current or long-standing practice without substantial supporting basic or clinical data. The recommendation is acceptable, but its necessity or usefulness may be questioned. The recommendation is made because it may be useful, and is not harmful. |