Summary
Body weight of twins at one year of age was analysed in comparison with that at birth. Mean weight at one year of age was the heaviest in the first-born males followed by the second-born males, the first-born females and the second-born females in this order, the same as that at birth of twin individuals, who were live-born and surviving at one year of age. As for the distribution of weight at one year of age, lower coefficient of variation, larger kurtosis and positively changed skewness were demonstrated, if compared to that at birth of “the live birth and surviving at one year of age” twin individuals. Increased intraclass correlation coefficient and decreased percent deviation of weight within the pair were observed from birth to the age of one year. The features were more clearly seen in MZ twins. A close relationship between the weight at bith and that at one year of age was seen, as for twin individuals and twin pairs combined. Growth rate of the sum of weight of twins at one year of age was linearly decreased as the sum of weight at birth was increased.
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Asaka, A., Imaizumi, Y. and Inouye, E. 1980. Analysis of multiple births in Japan. I. Weight at birth among 12,392 pairs of twins.Jpn. J. Human Genet. 25: 65–71.
Imaizumi, Y. and Inouye, E. 1979. Analysis of multiple birth rates in Japan. I. Secular trend, maternal age effect, and geographical variation in twinning rates.Acta Genet. Med. Gemellol. 28: 107–124.
Imaizumi, Y., Asaka, A. and Inouye, E. 1980. Analysis of multiple birth rates in Japan. II. Secular trend, and effect of birth order, maternal age and gestational age in stillbirth rate of twins.Acta Genet. Med. Gemellol. (in press)
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Asaka, A., Imaizumi, Y. & Inouye, E. Analysis of multiple births in Japan IV. Body weight of 4,317 twin pairs at one year of age. Jap J Human Genet 25, 309–317 (1980). https://doi.org/10.1007/BF01901732
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DOI: https://doi.org/10.1007/BF01901732
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Analysis of multiple births in Japan
Japanese journal of human genetics (1982)
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Analysis of multiple births in Japan
Japanese Journal of Human Genetics (1981)