Summary
Birth weight among 12,392 twin pairs were analysed in relation to survival state, sex and zygosity. Mean birth weights were higher in live birth than in stillbirth twins, and among the former the heaviest mean birth weight was seen in first-born males followed by second-born males, first-born females and second-born females in this order. Coefficient of variation was smaller in live birth than in stillbirth twins. Distribution of weight was negatively skewed in live birth twins, whereas it was positively skewed in stillbirth twins. Frequency of low-birth-weight (LBW) was higher in stillbirth than in live birth twins. It was indicated that estimated frequency of LBW was higher in MZ than in DZ twins in each category by birth order, sex and survival state.
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Asaka, A., Imaizumi, Y. & Inouye, E. Analysis of multiple births in Japan. Jap J Human Genet 25, 65–71 (1980). https://doi.org/10.1007/BF01873605
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DOI: https://doi.org/10.1007/BF01873605
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