COLORECTAL LENGTH IN JAPANESE AND AMERICAN ASYMPTOMATIC ADULTS BASED ON CT COLONOGRAPHY

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  • 日本人とアメリカ人の大腸の長さは違うのか？―大腸3D-CT（仮想内視鏡）による1,300名の検討―

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Objective : CT colonography (CTC) is an accurate examination for evaluating the colorectal length. The purpose of this study was to compare possible differences in colorectal length between Japanese and American asymptomatic adults with CTC. Methods : CTC studies in 1300 adults (650 Japanese and 650 American adults over 50 years of age) with technically adequate distension were analyzed using a colon imaging workstation. The total colorectal length and rectosigmoid length measurements were recorded for all patients. Results : Although the total colorectal length was significantly shorter (p-value = 0.003) in the Japanese group (average = 154.7 cm) compared to the American group (average = 158.2 cm), the effect size (0.17) was very small. There was no significant difference (p-value = 0.23, effect size = 0.07) in rectosigmoid length comparing the Japanese group (average = 62.5 cm) to the American group (average = 63.3 cm). The total colorectal lengths of the Japanese and American groups in the 50-59 years age group were 153.2 cm and 155.6 cm respectively, in the 60-69 years age group they were 155.2 cm and 159.3 cm respectively, and 161.8 cm and 165.2 cm, respectively, in the over-70 group. The total colorectal length significantly increased with age. Conclusion : In conclusion, we found that there was no overall difference in the total colorectal length or rectosigmoid length between Japanese and American adults. The total colorectal length increased with age in both the Japanese and American groups.

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