Summary
Analysis of factors affecting birth weight among twins and triplets was performed. The total weight of the twins and triplets was increased with gestational age. Maternal age and birth order at the twin biths had a close relationship with birth weight, and higher total weights were seen mostly in the middle of mother's age groups between 25 and 29 or 30 and 34 years in every birth order. The total weight of the twins was the highest in the household, occupation of the head of which was “agriculture only.” Seasonal variations of birth weight were observed and higher ones were seen in the twins born in March and September. The total birth weight was lower in the twins born to mothers who have previously experienced stillbirth before fifth months of pregnancy.
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Asaka, A., Imaizumi, Y. & Inouye, E. Analysis of multiple births in Japan. Jap J Human Genet 25, 213–218 (1980). https://doi.org/10.1007/BF01997698
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DOI: https://doi.org/10.1007/BF01997698