Picard R, Fraser D, Hagay Z J, Leiberman J R
Division of Obstetrics and Gynecology, Soroka Medical Center, Beer Sheva, Israel.
J Reprod Med. 1990 Feb;35(2):163-7.
Seasonality of births in southern Israel was examined in two populations, Jews and Bedouins, with distinctly different life-styles. The study included 1,444 twin births that occurred between the years 1970 and 1986. The peak month for the birth of monozygotic twins was September in both populations, while the maximum number of deliveries occurred in January for the Bedouins and August for the Jews. Of Jewish dizygotic twin births, higher rates were found from July to December. In addition, the peak months of singleton births in women aged 35 years and older and in women of high parity did not coincide with the peak months of multiple births. Maternal age and parity have been shown to greatly influence twin birth rates. The autumnal peak we found, which was independent of ethnic origin and its associated cultural and sociologic differences, was also independent of maternal age and parity and was consistent with findings in other populations in the northern hemisphere. That finding suggests that a seasonal factor, as yet undefined, affects the rates of multiple births.
在以色列南部，对生活方式截然不同的犹太人和贝都因人这两个人群的出生季节性进行了研究。该研究涵盖了1970年至1986年间发生的1444例双胞胎出生案例。在这两个人群中，单卵双胞胎出生的高峰月份均为9月，而贝都因人分娩数量最多的月份是1月，犹太人则是8月。在犹太双卵双胞胎出生案例中，7月至12月的发生率较高。此外，35岁及以上女性和多产女性单胎出生的高峰月份与多胎出生的高峰月份并不一致。研究表明，产妇年龄和产次对双胞胎出生率有很大影响。我们发现的秋季高峰，独立于种族起源及其相关的文化和社会学差异，也独立于产妇年龄和产次，并且与北半球其他人群的研究结果一致。这一发现表明，一个尚未明确的季节性因素会影响多胎出生率。
