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Influence of Sex on Birthweight Discordance in Twin Pairs

机译：性别对双胞胎出生体重不一致的影响

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摘要

For further verification of the relationship of birthweight discordance with the sex of newborn, 669 unlike-sexed twin pairs were studied. In both male-first (n=327) and female-first (n=342) pairs, males were heavier in mean birthweight but the difference was found to be statistically significant (p < 0.01) only in case of male-first combination. When comparison of rate of discordance in birthweight between male-first and female-first twins of unlike sex was considered, the female member of the twin pairs showed higher rate of discordance in birthweight indicating that the birthweight of female child was less than its male co-twin. The females were more discordant (lighter) than males in male-first and female-first groups ( x_1~2 = 7.49, p < 0.01 ). Equality of intrapair birthweight both in like sexed male (n=250) and female (n=250) twin pairs and statistically significant difference in mean birthweight between singleton of both sexes (t_(999)= 7.84, p < 0.01 ) were suggestive of role of Y chromosome in it. We seek explanation of gender difference from current understanding of molecular basis of Y chromosome and speculate six palindromes carrying recognized protein encoding genes which seem to be expressed specifically to testis for its development and function. It is concluded that sex hormone action might explain the differences in birthweight.
机译：为了进一步验证出生体重不一致与新生儿性别之间的关系，研究了669对不同性别的双胞胎。在男性优先（n = 327）和女性优先（n = 342）对中，男性的平均出生体重较重，但仅在男性优先组合的情况下，发现差异具有统计学意义（p <0.01）。当比较不同性别的男性第一对和女性第一对双胞胎的出生体重不一致率时，这对双胞胎中的女性成员显示出较高的出生体重不一致率，表明女孩的出生体重小于其男性。 -双胞胎。在男性至上和女性至上组中，女性比男性更不和谐（更轻）（x_1〜2 = 7.49，p <0.01）。性别相似的成对男性（n = 250）和女性（n = 250）的成对对内出生体重的均等性以及男女单胎平均出生体重之间的统计学显着性差异（t_（999）= 7.84，p <0.01）提示Y染色体在其中的作用。我们从目前对Y染色体分子基础的了解中寻求性别差异的解释，并推测六个回文携带公认的蛋白质编码基因，这些基因似乎专门针对睾丸的发育和功能而表达。结论是性激素的作用可能解释了出生体重的差异。

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