{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,1]],"date-time":"2026-02-01T03:25:10Z","timestamp":1769916310213,"version":"3.49.0"},"reference-count":22,"publisher":"Wiley","license":[{"start":{"date-parts":[[2013,1,1]],"date-time":"2013-01-01T00:00:00Z","timestamp":1356998400000},"content-version":"unspecified","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/3.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Journal of Pregnancy"],"published-print":{"date-parts":[[2013]]},"abstract":"<jats:p><jats:italic>Objective<\/jats:italic>. We investigated the possible factors related to the birth weight (BW) using the Japanese perinatal database.<jats:italic>Methods<\/jats:italic>. The live infants born at 37 to 41 weeks of gestation were enrolled in this study. Cases with diabetic pregnancy, preeclampsia, an anomalous fetus, and a fetus with chromosomal abnormalities were excluded. A multiple regression analysis for confounding factors and an analysis of covariance (ANCOVA) for comparing the BW in 2006 and 2010 were used for the statistical analysis.<jats:italic>Results<\/jats:italic>. The BW significantly decreased from 2950.8\u2009g in 2006 (<mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" id=\"M1\"><mml:mi>n<\/mml:mi><mml:mo>=<\/mml:mo><mml:mn>27,723<\/mml:mn><\/mml:math>) to 2937.5\u2009g in 2010 (<mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" id=\"M2\"><mml:mi>n<\/mml:mi><mml:mo>=<\/mml:mo><mml:mn>38,008<\/mml:mn><\/mml:math>) in the overall population, and this decrease was similar for male and female neonates. All confounding factors, except for the mode of delivery, affected the BW. Primiparity, smoking, and a female gender were related to the decrease in BW, whereas maternal age, maternal height, weight gain during pregnancy, BMI, the use of<jats:italic>in vitro<\/jats:italic>fertilization, induction of labor, and gestational duration were related to an increased BW. The ANCOVA showed that no significant change of the BW was seen between 2006 and 2010 (the difference was 2.164\u2009g,<mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" id=\"M3\"><mml:mi>P<\/mml:mi><mml:mo>=<\/mml:mo><mml:mn>0.414<\/mml:mn><\/mml:math>).<jats:italic>Conclusion<\/jats:italic>. The gestational duration is the most important factor affecting the BW in singleton term infants.<\/jats:p>","DOI":"10.1155\/2013\/172395","type":"journal-article","created":{"date-parts":[[2013,11,21]],"date-time":"2013-11-21T17:09:49Z","timestamp":1385053789000},"page":"1-5","source":"Crossref","is-referenced-by-count":29,"title":["Effects of Maternal Factors on Birth Weight in Japan"],"prefix":"10.1155","volume":"2013","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-1882-6981","authenticated-orcid":true,"given":"Misato","family":"Terada","sequence":"first","affiliation":[{"name":"Department of Obstetrics and Gynecology, Tokyo Women\u2019s Medical University, Kawada-cho 8-1, Shinjuku-ku, Tokyo 162-8666, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2890-2802","authenticated-orcid":true,"given":"Yoshio","family":"Matsuda","sequence":"additional","affiliation":[{"name":"Department of Obstetrics and Gynecology, Tokyo Women\u2019s Medical University, Kawada-cho 8-1, Shinjuku-ku, Tokyo 162-8666, Japan"},{"name":"Department of Obstetrics and Gynecology, International University of Health and Welfare Hospital, 537-3 Iguchi Nasushiobara, Tochigi 329-2763, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6876-4395","authenticated-orcid":true,"given":"Masaki","family":"Ogawa","sequence":"additional","affiliation":[{"name":"Department of Obstetrics and Gynecology, Tokyo Women\u2019s Medical University, Kawada-cho 8-1, Shinjuku-ku, Tokyo 162-8666, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Hideo","family":"Matsui","sequence":"additional","affiliation":[{"name":"Department of Obstetrics and Gynecology, Tokyo Women\u2019s Medical University, Kawada-cho 8-1, Shinjuku-ku, Tokyo 162-8666, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Shoji","family":"Satoh","sequence":"additional","affiliation":[{"name":"Maternal and Perinatal Care Center, Oita Prefectural Hospital, Bunyo 476, Oita 870-8511, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","reference":[{"issue":"4","key":"1","doi-asserted-by":"crossref","first-page":"260","DOI":"10.1053\/sper.2002.34772","volume":"26","year":"2002","journal-title":"Seminars in Perinatology"},{"key":"2","doi-asserted-by":"publisher","DOI":"10.1034\/j.1600-0412.2003.00112.x"},{"issue":"6","key":"3","doi-asserted-by":"crossref","first-page":"1269","DOI":"10.1093\/ije\/30.6.1269","volume":"30","year":"2001","journal-title":"International Journal of 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