The craniomandibular index: validity.

The CMI appears to be valid for use in clinical studies, but users must be aware of its numerous potential errors and its associated strict methodologic guidelines to ensure accuracy and reproducibility of results. The subjective nature of some items demands that the same rater who is unaware of the management status of the patient perform both evaluations. If multiple raters are used, it is recommended that the raters discuss all items, and compare scoring of demonstration subjects before the study and use a pressure algometer for muscle palpation.