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Different grades of muscle echogenicity divided by images and clips as determined by the mean prevalence observed across raters.
| All raters | Global (images + clips) | Images | Clips |
| Grade 0 | 18.3% | 25.0% | 18.2% |
| Grade 1 | 21.7% | 23.8% | 21.2% |
| Grade 2 | 27.5% | 25.0% | 25.2% |
| Grade 3 | 32.5% | 26.2% | 35.4% |
Participants were asked to score a total of 80 images and 20 clips (global number of evaluations = 100).
