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麻疹 猩红热流行中存在 Z |
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程颖恺 曾光
【摘要】 目的 进一步论证疾病流行中“Z-D现象”的存在,并探讨其与病种和时间序列的关系。方法 利用1975~1996年全国疫情资料,建立了麻疹、猩红热两种疾病1975~1995年、1980~1995年、1985~1995年和1990~1995年4个不同长度的时间序列,进行最佳截取点的月累计百分位数与前兆升降比的相关分析,并通过构建外推模型进行了预测研究。结果 相关分析显示:在上述两种疾病4个时间序列共236份资料中,98.3%的资料R<0(232/236),这进一步论证了疾病流行中“Z-D现象”的存在。从时间序列来看,R<0,P<0.05的资料在上述4个时间序列中所占比例分别为:63.8%、54.2%、44.1%、35.0%,四者之间差异有显著性(χ2=10.86,P<0.05)。从病种来看,麻疹R<0,P<0.05的资料,在上述4个时间序列中所占比例分别为:73.3%、56.7%、36.7%、36.7%,四者之间差异有显著性(χ2=11.16,P<0.05);猩红热为:53.6%、51.8%、51.7%、33.3%。说明“Z-D现象”与时间序列、病种的相关性。外推模型的预测结果显示:麻疹在1975~1995年、1985~1995年两个时间序列上的预测符合率(65.5%、37.0%)差异有显著性(χ2=4.54,P<0.05),表现出随时间序列的延长预测符合率增高,随R值减小(绝对值增大)猩红热的预测符合率升高的趋势。结论 可从资料来源、时间序列长度等方面来判断资料的预测价值。 【关键词】 麻疹 猩红热 Z-D现象 外推模型
Zeng-Ding phenomenon:Further demonstration and studies on its predictive value in epidemic of measles and scarlet fever
CHENG Yingkai,ZENG Guang. Institute of Epidemiology and Microbiology,Chinese Academy of Preventive Medicine,Beijing 100050
【Abstract】 Objective To demonstrate further the existence of Zeng-Ding phenomenon in disease epidemic and to explore the relationship between it and the time series in different kinds of diseases. Methods Incidence data of notifiable communicable diseases during 1975 to 1996 were collected. Time series of measles and scarlet fever incidence during 1975 to 1995,1980 to 1995, 1985 to 1995 and 1990 to 1995 were established. Correlation analysis was conducted between monthly cumulative percentage and predictive ratio of increase to decrease in incidence rate at the best cut-off point. Prediction was studied based on the constructed extrapolation model. Results Correlation analysis showed that 98.3% (232/236) of the coefficients of correlation were negative (R<0),indicating further the existence of Zeng-Ding phenomenon in disease epidemic. There was significant difference in coefficients of correlation between the four time series,[1] [2] 下一页 上一个医学论文: 垂直传播中乙型肝炎病毒S区变异株检出及其流行病学意义 下一个医学论文: 核转录因子kappa B的研究进展
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