| 王文初.应用圆形分布探讨流行性脑脊髓膜炎发病季节性[J].Chinese journal of Epidemiology,1994,15(5):286-288 |
| 应用圆形分布探讨流行性脑脊髓膜炎发病季节性 |
| A Study on Seasonal Variation of Epidemic Cerebrospinal Meningitis with Circular Distribution Method |
| Received:June 10, 1993 Revised:August 03, 1993 |
| DOI： |
| KeyWord: 流行性脑脊髓膜炎 季节性 圆形分布 |
| English Key Word: Epidemic cerebrospinal meningitis Seasonal variation Circular distribution |
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| Abstract: |
| 为探讨流行性脑脊髓膜炎发病季节性,笔者对常德市1959~1990年流脑发病资料进行了圆形分布分析。结果表明:流行性脑脊髓膜炎发病具有明显的季节性,32年中有28年发病高峰日在3月份,有26年95%的流行期始于上年10月份以后,终止于当年6月份以前,年发病率与圆形分布r值呈正相关,与角的标准差呈负相关,与平均角a无相关。提示年发病率高低影响发病季节性强弱,而与发病高峰日的早晚无关。 |
| English Abstract: |
| In order to study the seasonal variation of epidemic cerebrospinal meningitis (ECM) incidence, the data of ECM incidence during the period 1959~1990 in Changde City were analysed with circular distribution method. The result showed that the seasonal variation was obvious. In 28 of these 32 years, the highest peak of the ECM incidence occurred in March. In 26 years, 95% of epidemic periods began from October to June of the next year. The annual incidence rate had positive corretation with the r value of circular distribution, negative correlation with angular deviation and no correlation with mean angle a. It is concluded that the annual incidence rate concerns with the seasonal variation and does not concern with the date of the highest peak. |
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