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Criteria for biomechanical measures (extracted from text of Brand [1])
| Reproducible |
| Stable (independent of mood, motivation and pain) |
| Accurate |
| Appropriately validated |
| Capable of distinguishing between normal and abnormal |
| Must not alter the function it is measuring |
| Reported in form analogous to accepted clinical concepts |
| Cost-effective |
| Not observable by the skilled clinician |
