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Table 3 Perceived difficulty scores, according to the NRS score and their corresponding increase in difficulty level

From: Perturbation-based balance training to improve balance control and reduce falls in older adults – study protocol for a randomized controlled trial

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%

  1. 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