Bønnelykke B
J Biosoc Sci. 1989 Jul;21(3):329-34. doi: 10.1017/s0021932000018022.
The menarcheal age and frequency of menstrual disorders in mothers of dizygotic (DZ) and monozygotic (MZ) twins born in Denmark in 1984 or 1985 were compared with a control sample of mothers of singleton infants born in the same period. Compared to control mothers, mothers of DZ twins had a lower menarcheal age and a lower frequency of menstrual irregularities--menstrual cycles exceeding 5 weeks duration, varying length of menstrual cycles and episodes of menostasia. Mothers of MZ twins had a higher frequency of intermenstrual bleeding compared to mothers of singletons. All results were adjusted for maternal age and parity. The findings are relevant to the interpretation of aetiological factors leading to twin births and support the hypothesis of differences in sex hormone activity of the mothers of DZ twins in comparison with other women.
对1984年或1985年在丹麦出生的双卵双胞胎（DZ）和单卵双胞胎（MZ）的母亲的初潮年龄和月经紊乱频率，与同期出生的单胎婴儿母亲的对照样本进行了比较。与对照母亲相比，DZ双胞胎的母亲初潮年龄较低，月经不规律的频率也较低——月经周期超过5周、月经周期长短不一以及闭经情况。与单胎母亲相比，MZ双胞胎的母亲经间期出血频率更高。所有结果均根据母亲年龄和产次进行了调整。这些发现与导致双胞胎出生的病因因素的解释相关，并支持了DZ双胞胎母亲与其他女性相比性激素活性存在差异的假说。
