A Chinese epidemiological study on cervical spondylosis Wang B et al (2004) investigated 1009 Chinese people. They study consisted of Questionnaires and X-rays of people with different occupations, ages, and sexes.
High and middle pillow-lovers occupied 80.03%.
Imaging features: most of the degenerative changes of cervical spine were located between C5-6 (40.79%), C4-5 (26.29%), and C6-7 (18.20%).
Patients with vertebral osteophyte were 65.75%, intervertebral space narrow 36.87%, intervertebral foramen narrow 29.19%, and physiological curve change 31.03%.