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采用１ ：１ 配比的病例对照对铜陵市一起甲型肝炎爆发流行进行调查。将调查发现的危险因素，分别计算单因素的ＯＲ 值和χ２ＭＨ 值，对有统计学意义的１６ 项危险因素进行多因素条件Ｌｏｇｉｓｔｉｃ 回归分析，筛选出甲肝发病与食果酱面包，在校门口买面包，吃棒棒冰等因素有关，与发病联系强度是食果酱面包高于吃棒棒冰。生产加工果酱面包条件和环境卫生很差，面包卫生质量无法保证。销售果酱面包的时间与地点，与病人发病时间和病例分布范围是吻合的
The case-control of 1: 1 ratio was used to investigate the epidemic of hepatitis A in Tongling City. We will investigate the risk factors found, were calculated single-factor OR and χ2MH values of statistically significant 16 risk factors by conditional multivariate Logistic regression analysis of hepatitis A pathogenesis and jam picks, bread at the gate to buy bread , Eating ice lolly and other factors, and the incidence of contact strength is higher than eating bread with bread jam stick ice. Production and processing of jam bread conditions and sanitation is poor, the quality of bread can not be guaranteed. The time and place for the sale of jam bread are consistent with the time of onset and the distribution of cases