A study on the risk factors for the occurence of colorectal adenoma

Abstract

Objective To investigate risk factors for colorectal adenoma. Methods 1260 subjects who received health check-ups were included. A questionnaire on life style was answered and anthropometric measurements including height, weight, waist circumference and blood pressure were taken.Fasting venous blood was obtained and fasting plasma glucose, total cholesterol, triglycerides(TG), highdensity lipoprotein cholesterol (HDL-C) and low density lipoprotein cholesterol (LDL-C) were measured.Fatty liver was diagnosed by ultrasonography. Colonoscopy was performed on each subject. Categorical data were compared using Pearson's chi-squared test, and multivariate logistic regression analysis was used to estimate the strength of association between the colorectal adenoma and various factors. Results The frequency of colorectal adenoma was significantly higher among males, older patients( ≥55 years), current smokers and subjects with less physical activity, abdominal obesity, fasting hyperglycemia or fatty liver (x2 =4.355, 11.549, 4.440, 4.608, 6.211, 4.510, 4.156, P＜0. 05). Male sex (OR: 1.61,CI:1.13 -2. 57), old age (OR: 4.41,CI:3.32- 10.27)and abdominal obesity (OR: 1.75,CI:1.21 -2.86)were independent risk factors for colorectal adenoma. However, the frequency of colorectal adenoma was not different in subjects above 55 years old according to gender and abdominal obesity( x2 = 1. 139, 3. 413 ,P ＞0. 05 ). Conclusions Abdominal obesity, old age and male sex were significantly associated with colorectal adenoma. However, the effect of abdominal obesity and male sex on the development of colorectal adenoma is less significant in subjects above 55 years of age. It is especially important for people under 55 years old to prevent colorectal adenoma by avoiding abdominal obesity. Key words: Colorectal neoplasms; Adenoma; Risk factors; Obesity