logistic多元回归分析结果显示，换工、接触沟渠水、菜园地排野粪、生活用沟水和水稻田劳动是影响病史率高低的重要因素；

• The results from multi logistic regression analysis suggest that labor exchange, contacting infested water, defecating in ve getable field, using water in ditches and canals for daily life and working in paddyfields were the important factors influencing the prevalence.