Abstract：Objective To learn the prevalence and risk factors of anorectal diseases among urban population aged 18-80 years in Lanxi. Methods Typical sampling was adopted to select one urban area from Lanxi City. Face-to-face interviews and physical examinations were carried out to collect data during June 2015 to September 2015. Results A total of 3 327 residents were recruited, of which 2 931 were involved in both questionnaires and physical examinations. Totally, 1 554 participants were detected one or more anorectal diseases. The prevalence rate was 53.02% (standardized rate 45.61%).Hemorrhoids cases was accounted to the most, and the prevalence rate was 49.47% (standardized rate 42.41%). Male was associated lower risk of hemorrhoid (OR=0.37, 95%CI 0.32-0.44). Compared to 18-30 age group, older age were associated with increasing risks of hemorrhoid significantly despite of 31- age group. Results for different groups were 41-(OR=1.66,95%CI1.05-2.62), 51-(OR=1.94,95%CI1.23-3.07), 61-(OR=1.92,95%CI1.19-3.09) and 71-80 (OR=2.62,95%CI1.57-4.39).Only junior high school (OR=1.30, 95%CI 1.01-1.66) and senior high school (OR=1.57, 95%CI 1.19-2.07) were significantly associated with high risk of hemorrhoid. Conclusion The prevalence of anorectal diseases in Lanxi urban area is high. Gender, age and education level might be independent risk factors of hemorrhoid. Therefore, preventive strategies should vary across different population with different characteristics.
