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目的探讨保山市2005-2014年流行性乙型脑炎发病的时间分布特征。方法应用集中度和圆形分布法对保山市2005-2014年流行性乙型脑炎疫情资料进行处理、分析。结果 2005-2014年保山市流行性乙型脑炎发病时间分布的集中度M=0.818,圆形分布r=0.820,平均角ā=203.87°,Z=205.08,P<0.0001,发病高峰日为第238日,流行高峰期是200~274日。结论保山市2005-2014年流行性乙型脑炎发病有很强的季节性,集中度和圆形分布指标可以较为准确地反映保山市乙型脑炎的流行高峰及流行时间。
Objective To explore the time distribution of epidemic encephalitis in Baoshan from 2005 to 2014. Methods The epidemic data of epidemic encephalitis from 2005 to 2014 in Baoshan City were processed and analyzed by using the concentration and circular distribution method. Results The incidence of Japanese encephalitis during the period from 2005 to 2014 was M = 0.818, the distribution of roundness was r = 0.820, the average angle was 203.87 °, Z = 205.08, P <0.0001, and the peak incidence day was 238 days, the peak of the epidemic is 200 ~ 274 days. Conclusion The incidence of Japanese encephalitis from 2005 to 2014 in Baoshan is quite seasonal. Concentration and circular distribution can accurately reflect the epidemic peak and prevalence of Japanese encephalitis in Baoshan.