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Perceived difficulty scores, according to the NRS score and their corresponding increase in difficulty level
| NRS score (0–10) | Increase in difficulty level (percentage) |
|---|---|
| 1 | 15% |
| 2 | 15% |
| 3 | 15% |
| 4 | 10% |
| 5 | 10% |
| 6 | 5% |
| 7 | 5% |
| 8 | 0% |
| 9 | 0% |
| 10 | 0% or decrease by 5–10% |
NRS score Numeric Rating Scale score. Increase in difficulty level: The percentage by which the difficulty level will be increased if the subject scores the corresponding NRS score
