A survey was made to investigate the relation of 120 cases of ossification of posterior longitudinal ligament in the cervical spine to their age, sex and daily and occupational environment. Average age was 57.5±10.2 in male and 51.6±8.5 in female. The patients of fifth and sixth decades are larger in number than other decades.
Their occupations were mostly light labors, who were asked for the sitting position for a long time. Past histories of diabetes mellitus were not numerous in relation to the control group.
