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The subjects’ disability level according to NDI.
| Disability level according to NDI | Study group | |
|---|---|---|
| N | % | |
| No disability (up to 20%) | 47 | 78.3 |
| Mild disability (21–40%) | 10 | 16.7 |
| Moderate disability (41–60%) | 3 | 5.0 |
| Severe disability (61–80%) | 0 | 0.0 |
| Total disability (81–100%) | 0 | 0.0 |
| Total | 60 | 100.0 |
