Holland B
Hum Biol. 1989 Aug;61(4):591-8.
A marked seasonality of births for the two main ethnic groups of peninsular Malaysia, far exceeding the cyclic fluctuations in births in the United States and Canada, was reported for the 1960s. A 36% excess of births over the average monthly number was observed among Malays each January. Among the ethnic Chinese in Malaysia a regular periodicity in the numbers of births was also found, but it was far less marked and the peak occurred in October or November. The peaks in both groups were due in large measure to conceptions that correlate with religious observances or holidays. Here I report on cyclic birth patterns in peninsular Malaysia for the period 1970-1985. Rapid economic development has occurred during this time and has brought with it demographic changes, such as a massive rise in contraceptive use and a decline in birth rates. These demographic changes have been accompanied by the loss of the pronounced seasonal pattern of births among the Malays. The seasonality of Malay births is now of roughly the same magnitude as the seasonality in the United States and Canada, whereas seasonality of births among the Chinese in Malaysia remains essentially unchanged.
据报道，20世纪60年代马来西亚半岛两个主要族群的出生情况呈现出显著的季节性，远远超过美国和加拿大出生人数的周期性波动。每年1月，马来人的出生人数比月平均出生人数高出36%。在马来西亚的华裔中也发现了出生人数的规律周期性，但不太明显，高峰期出现在10月或11月。这两个族群的出生高峰期在很大程度上都归因于与宗教仪式或节日相关的受孕。在此，我报告1970 - 1985年期间马来西亚半岛的周期性出生模式。在此期间，经济迅速发展，并带来了人口结构变化，如避孕药具使用大幅增加和出生率下降。这些人口结构变化伴随着马来人出生的明显季节性模式的消失。现在，马来人出生的季节性与美国和加拿大的季节性大致相同，而马来西亚华人出生的季节性基本保持不变。
