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首页> 外文期刊>Twin research and human genetics : >Twin-singleton differences in intelligence: a register-based birth cohort study of Norwegian males.
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Twin-singleton differences in intelligence: a register-based birth cohort study of Norwegian males.

机译：双单人智力差异：基于登记的挪威男性出生队列研究。

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The aim was to determine the difference in intelligence between singletons and twins in young adulthood. Data from the Medical Birth Register of Norway were linked with register data from the Norwegian National Conscript Service. The study base consisted of data on the 445,463 males who were born alive in either single or twin births in Norway during 1967-1984 and who were examined at the time of the mandatory military conscription (age 18-20). Within this study base, there were data on 1,653 sibships of full brothers that included at least one man born in single birth and at least one man born in twin birth (4,307 persons, including 2,378 twins and 1,929 singletons). The intelligence scores of the singletons were 11% (95% confidence interval [CI]: 9-14%) of a standard deviation higher than those of the twins, after adjustment for birth year, birth order, parental ages at delivery, parental education levels, and other factors. The adjusted within-family difference was also 11% (95 % CI: 6-16%) of a standard deviation, indicating that unmeasured factors shared by siblings (e.g., maternal body height) have not influenced the estimate in important ways. When gestational age at birth was added to the model, the estimate for the difference in intelligence score was approximately the same. Including birth weight in the model strongly reduced the estimate. In conclusion, twins born in Norway during 1967-1984 had slightly lower intelligence in early adulthood compared with the singletons.
机译：目的是确定成年后单身和双胞胎之间的智力差异。挪威医疗出生登记簿中的数据与挪威国家应征国家服务局的登记簿数据相关联。该研究基础包括1967-1984年挪威445,463名单胎或双胎活产男婴的数据，并在进行强制性兵役时（18-20岁）进行了检查。在该研究基地中，有关于1,653个全兄弟同胞的数据，其中包括至少一个单胞胎出生的男人和至少一个双胞胎出生的男人（4,307人，包括2,378双胞胎和1,929单身）。调整出生年份，出生顺序，分娩时的父母年龄，父母的教育程度后，单身人士的智力得分比双胞胎的智商得分高11％（95％置信区间[CI]：9-14％）。水平和其他因素。调整后的家庭内部差异也为标准偏差的11％（95％CI：6-16％），这表明兄弟姐妹共享的无法衡量的因素（例如孕妇身高）并未以重要方式影响估计值。将出生时的胎龄添加到模型中时，智力得分差异的估计值大致相同。在模型中包括出生体重，大大降低了估计值。总之，与单身者相比，1967-1984年在挪威出生的双胞胎的成年早期智力稍低。

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