评价麻风防治效果多根据患病率、发病率或发现率的下降速度。但某年的发现率(发病率)、患病率往往受某些因素的影响而缺乏准确性。如发现率、患病率因某年开展了大规模调查会突然升高;发病率则因麻风初发时症状轻微,不易被患者发现,就诊时靠患者回顾,故准确性很差。因此这些指标的下降多呈波浪型。计算年平均递减率的传统方法是水平法,仅以基期水平(ao)与末期水平(an)为转移,用以评价麻风防治效果有较大偏差。若ao或an处在高峰或低峰时,计算结果容易失真可信性较差。其公式为平均下降速度 Evaluation of leprosy prevention and control and more based on the prevalence, morbidity or discovery rate of decline. However, the detection rate (morbidity) of a year, the prevalence is often affected by some factors and the lack of accuracy. Such as the discovery rate, the prevalence of a large-scale survey of a sudden increase will occur; the incidence of leprosy due to minor symptoms at the onset, not easy to be found by patients, treatment by patient review, so the accuracy is poor. Therefore, the decline of these indicators is more and more wave type. The traditional method of calculating the average annual decline rate is the horizontal method. Only the basal level (ao) and the terminal level (an) are transferred to evaluate the effect of leprosy control. If ao or an is at a peak or a low peak, the calculation result is easily distorted with poor credibility. The formula for the average rate of decline