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对蓬溪县１９５３１９９２ 年百日咳发病季节特征进行分析，求得发病高峰时点为３ 月下旬，高峰时区为２ 月上旬５ 月上旬。结果显示，简单余弦曲线拟合可使发病率Ｙｉ 的变异减少９８－６５ ％ ，用含第二谐量三角多项式拟合可使Ｙｉ 的变异减少９９－７９ ％ 。
The characteristics of seasonal occurrence of pertussis in Pengxi County in 1953 were analyzed. The peak time of onset was at the end of March and the peak time zone was early February in early February. The results show that simple cosine curve fitting can reduce the variability of the incidence of Yi 98-65 %, and using the second harmonic triangle polynomial fitting can reduce the variation of Yi by 99-79 %.