Abstract
From the results of lifestyle disease prevention medical examinations requiring colorectal cancer examinations (IFOBT 2-day method) by the Japan Health Insurance Association, the workplace colorectal cancer screening rate and close examination screening rate were compared and reviewed. The scope was examinees who underwent such examinations by the Association from April 2011 to March 2016, with a total of 218,764 examinees (158,432 men and 60,332 women). Colorectal cancer was discovered in 85 men and 16 women. The screening rate was 89.1%, and 5.1% required a close examination, of which 36.1% returned for one; the discovery rate was 0.052%. Among males, 91.3% underwent screening, 5.5% required a close examination, of which 33.4% returned for one; the discovery rate was 0.059%. Among females, 83.3% underwent screening, 3.8% required a close examination, of which 47.1% returned for one; the discovery rate was 0.032%.
The screening rate of women in their 30s and 40s was low compared to men of the same age, but the rates converged among examinees in their 50s. The screening rate of people who submitted one specimen was highest among examinees in their 30s, and decreased with age. Among people who submitted two specimens, the screening rate of women in their 30s and 40s was considerably lower than for males, due to the effect of menstruation. The percentage of males that required a close examination was high, and the percentage of females who returned for one was high. Examinees in their 40s had the lowest rate of return. Among both men and women who submitted two specimens, the screening rate, percentage requiring a close examination, and percentage who returned were higher than those who submitted one specimen. Recommending people who have submitted one specimen to submit another is effective in improving the rate of returning for a close examination.
