Vol. 1 Issue 56
1. 77% of all subjects and 89% of females exhibited a marked reduction, absence or reversal of the normal cervical curve of the spine.
2. 97% of all subjects on x-ray had at least one significant abnormality of the cervical spine. 43% exhibited abnormalities at four or more segments.
3. Motion between the skull and the first cervical bone was reduced in 90% of subjects in flexion and 70% of the subjects in extension.
SOURCE: Journal of Manipulative and Physiological Therapeutics Volume 15 • Number 7 • September, 1992