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应用圆分布分析法对莱芜市22年间两次伤寒流行的发病时间进行了分析。第一次流行在1958年—1968年共发生2239例,按月发病时间计算的平均角度为287.4°(291天),发病高峰在10月18日。第二次流行在1975年—1985年共发生606例,平均角度为294.5°(299天),发病高峰在10月26日。对两个平均角进行显著性检验,F=9.4,P<0.01。即两次流行发病时间的平均角间有高度显著性差异。
The circular distribution analysis was used to analyze the incidence of two typhoid fever episodes during the 22 years in Laiwu. The first epidemic in 1958 - 1968 occurred a total of 2239 cases, the average monthly incidence of the calculated point of view was 287.4 ° (291 days), the peak incidence on October 18. The second epidemic in 1975 - 1985, a total of 606 cases occurred, the average angle of 294.5 ° (299 days), the peak incidence on October 26. Significant tests were performed on the two mean angles, F = 9.4, P <0.01. That is, the prevalence of the two epidemic peak average angle between the highly significant differences.