Birth Cohort Analysis of the Death Caused by Malignant Neoplasm of Digestive System in Japan.
10.2185/jjrm.49.740
- VernacularTitle:わが国における消化器系悪性新生物死亡の出生コホート分析
- Author:
Motomi YOKOTA
- Publication Type:Journal Article
- From:Journal of the Japanese Association of Rural Medicine
2001;49(5):740-749
- CountryJapan
- Language:Japanese
-
Abstract:
Five-year birth cohort analyses of the death rate for the cancers of the digestive system was performed, specifically for the cancer of the esophagus, the stomach, the colon, the rectum and the pancreas by sex. Further more, study was made by dividing Japanese prefectures into blocks to find out the future trend and regional characteristics of cancer death. The following is a summary of our finding.
1) Cancer of the esophagus: A phenomenon was recognized that the death rate decreased as the year of birth became later both in men and in women. This phenomenon started at the ages from 55 to 65 in men and the ages from 30 to 45 in women. No regional difference was noted.
2) Cancer of the stomach: A phenomenon was recognized that the death rate decreased as the year of birth became later both in men and in women or national level.
3) Cancer of the colon: The death rate in each age cohort increased or stayed flat, as the year of birth became later, for men in the Hokkaido area and for women in the Tokai and Chugoku-Shikoku areas. The counter-clockwise rotation of the death-rate curve on the graph was acknowledged in other areas and at national level both in men and in women. The age that became the core of the rotation was the highest in the Hokuriku-Tosan area both in men and in women, but it was the same in men and in women in many other areas.
4) Cancer of the rectum: The death rate in each age group increased or stayed flat, as the year of birth became later, in men in the Hokkaido area. The counter-clockwise rotation of the death-rate curve on the graph was recognized in the areas other than Hokkaido and at national level and there was no difference area-wise in the age that became the core of the rotation.
5) Cancer of the pancreas: The death rate in each age group increased or stayedflat, as the year of birth became latter, in men in the Hokuriku-Tosan area and in women in the Tohoku area. The Counter-clockwise rotation of the death rate curve on the graph was acknowledged in both men and women in other areas.
