Abstract
The results of colorectal cancer screenings (IFOBT 2-day method) among 35- to 74-year-old males who underwent lifestyle disease prevention medical examinations by the Association between April 2012 and March 2017 were analyzed by occupation. Among 164,652 total examinees, 150,688 underwent an examination for colorectal cancer, and 92 were found with colorectal cancer. During this five-year period, 91.5% underwent screening; 5.5% required a close examination, of which 35.6% returned for one; the discovery rate was 0.061%.
After age adjustment, the screening rate was highest, in order, among "specialist and technical workers", "administrative and managerial workers", and "agriculture, forestry and fishery workers"; and lowest among "transportation and communication workers", "security workers" and "service workers". The ratio of men requiring close examination was highest, in order, among transportation and communication workers, "sales workers" and service workers; and lowest among security workers, "clerical workers" and "production process and related workers". The ratio of examinees who returned for close examination was highest among administrative and managerial workers, specialist and technical workers, and agriculture, forestry and fishery workers; and lowest among transportation and communication workers, security workers and service workers. The discovery rate was highest among agriculture, forestry and fishery workers, transportation and communication workers, and clerical workers; and lowest among security workers, administrative and managerial workers, and specialist and technical workers. Among the examinees, the percentage of those engaged in night work was highest, in order, in security (73.9%), transportation and communication (45.7%), services (44.0%), and production process and related work (13.9%).
In occupations with night work, the ratio of those requiring close examination and the ratio of those who submitted two specimens were low. By encouraging close examination and submission of two specimens, centering on occupations with night work, the screening rate for colorectal cancer and close examination rate may increase.
