Matsuda S, Sone T, Doi T, Kahyo H
Department of Human Ecology, School of Medicine, Kitakyushu.
Nihon Eiseigaku Zasshi. 1992 Feb;46(6):1063-70. doi: 10.1265/jjh.46.1063.
Seasonal variation of mean birth weight in Okinawa was examined by a traditional time-series analysis, which decomposed the variation in a series into trends, seasonal variations, other cyclic changes, and remaining irregular fluctuations, based on the data in Vital Statistics from January 1974 to December 1983. The seasonal index of mean birth weight showed a peak in winter to early spring and a bottom in summer with statistical significance. Previous reports have revealed that the gestational period is the most important factor associated with birth weight. Therefore, we carried out the time series analysis for the mean gestational period but could not observe seasonal periodicity in it. On the other hand, mean birth weight at 40 gestational weeks was significantly lower in summer. These results suggest that factors other than the gestational period, such as infectious diseases, nutritional conditions and so on, might play important role in seasonal variations of mean birth weight in Okinawa.
基于1974年1月至1983年12月生命统计数据，采用传统时间序列分析方法研究了冲绳县平均出生体重的季节性变化，该方法将序列变化分解为趋势、季节变化、其他周期性变化和剩余不规则波动。平均出生体重的季节指数在冬季至早春出现峰值，在夏季出现谷底，具有统计学意义。先前的报告显示，妊娠期是与出生体重相关的最重要因素。因此，我们对平均妊娠期进行了时间序列分析，但未观察到其中的季节性周期性。另一方面，孕40周时的平均出生体重在夏季显著较低。这些结果表明，除妊娠期外的其他因素，如传染病、营养状况等，可能在冲绳县平均出生体重的季节性变化中起重要作用。
