{"id":"https://openalex.org/W2004388983","doi":"https://doi.org/10.1515/jpm.2003.028","title":"Effect of maternal age on blood loss during parturition: a retrospective multivariate analysis of 10,053 cases","display_name":"Effect of maternal age on blood loss during parturition: a retrospective multivariate analysis of 10,053 cases","publication_year":2003,"publication_date":"2003-01-14","ids":{"openalex":"https://openalex.org/W2004388983","doi":"https://doi.org/10.1515/jpm.2003.028","mag":"2004388983","pmid":"https://pubmed.ncbi.nlm.nih.gov/12825476"},"language":"en","primary_location":{"id":"doi:10.1515/jpm.2003.028","doi":"https://doi.org/10.1515/jpm.2003.028","is_oa":false,"landing_page_url":"https://doi.org/10.1515/jpm.2003.028","pdf_url":null,"source":{"id":"https://openalex.org/S61009040","display_name":"Journal of Perinatal Medicine","issn_l":"0300-5577","issn":["0300-5577","1619-3997"],"is_oa":false,"is_in_doaj":true,"is_core":true,"listed_in":["anvur-scientific","cwts-core","doaj","dongbi-c","doyens","jufo-1","ki-jl-1","medline","norway-1","poland-40","russia-white-list-1","vabb-shw"],"host_organization":"https://openalex.org/P4310313990","host_organization_name":"De Gruyter","host_organization_lineage":["https://openalex.org/P4310313990"],"host_organization_lineage_names":["De Gruyter"],"type":"journal"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Journal of Perinatal Medicine","raw_type":"journal-article"},"volume":null,"type":"article","is_traditional":true,"indexed_in":["crossref","doaj","pubmed"],"open_access":{"is_oa":false,"oa_status":"closed","oa_url":null,"any_repository_has_fulltext":false},"authorships":[{"author_position":"first","author":{"id":"https://openalex.org/A5004039696","display_name":"Akihide Ohkuchi","orcid":"https://orcid.org/0000-0002-8861-1572","observed_orcids":["https://orcid.org/0000-0002-8861-1572"]},"institutions":[{"id":"https://openalex.org/I146500386","display_name":"Jichi Medical University","ror":"https://ror.org/010hz0g26","country_code":"JP","type":"education","lineage":["https://openalex.org/I146500386"]},{"id":"https://openalex.org/I4210153031","display_name":"Jichi Medical University Hospital","ror":"https://ror.org/04at0zw32","country_code":"JP","type":"healthcare","lineage":["https://openalex.org/I4210153031"]}],"countries":["JP"],"is_corresponding":false,"raw_author_name":"A. Ohkuchi","raw_affiliation_strings":["Department of Obstetrics and Gynecology, Jichi Medical School, Tochigi, Japan. okuchi@jichi.ac.jp"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Department of Obstetrics and Gynecology, Jichi Medical School, Tochigi, Japan. okuchi@jichi.ac.jp","institution_ids":["https://openalex.org/I146500386","https://openalex.org/I4210153031"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5091102573","display_name":"Tamaho Onagawa","orcid":null,"observed_orcids":[]},"institutions":[],"countries":[],"is_corresponding":false,"raw_author_name":"T. Onagawa","raw_affiliation_strings":[],"raw_orcid":null,"affiliations":[]},{"author_position":"middle","author":{"id":"https://openalex.org/A5103183141","display_name":"Rie Usui","orcid":"https://orcid.org/0000-0003-1078-0218","observed_orcids":["https://orcid.org/0000-0003-1078-0218"]},"institutions":[],"countries":[],"is_corresponding":false,"raw_author_name":"R. Usui","raw_affiliation_strings":[],"raw_orcid":null,"affiliations":[]},{"author_position":"middle","author":{"id":"https://openalex.org/A5042544807","display_name":"Tomoyuki Koike","orcid":"https://orcid.org/0000-0001-6472-3257","observed_orcids":["https://orcid.org/0000-0001-6472-3257"]},"institutions":[],"countries":[],"is_corresponding":false,"raw_author_name":"T. Koike","raw_affiliation_strings":[],"raw_orcid":null,"affiliations":[]},{"author_position":"middle","author":{"id":"https://openalex.org/A5019687998","display_name":"Marcel Hiratsuka","orcid":"https://orcid.org/0000-0003-0347-5901","observed_orcids":["https://orcid.org/0000-0003-0347-5901"]},"institutions":[],"countries":[],"is_corresponding":false,"raw_author_name":"M. Hiratsuka","raw_affiliation_strings":[],"raw_orcid":null,"affiliations":[]},{"author_position":"middle","author":{"id":"https://openalex.org/A5040041500","display_name":"Aliya Izumi","orcid":"https://orcid.org/0009-0007-6888-9431","observed_orcids":["https://orcid.org/0009-0007-6888-9431"]},"institutions":[],"countries":[],"is_corresponding":false,"raw_author_name":"A. Izumi","raw_affiliation_strings":[],"raw_orcid":null,"affiliations":[]},{"author_position":"middle","author":{"id":"https://openalex.org/A5083199442","display_name":"Takashi Ohkusa","orcid":null,"observed_orcids":[]},"institutions":[],"countries":[],"is_corresponding":false,"raw_author_name":"T. Ohkusa","raw_affiliation_strings":[],"raw_orcid":null,"affiliations":[]},{"author_position":"middle","author":{"id":"https://openalex.org/A5046936386","display_name":"Shigeki Matsubara","orcid":"https://orcid.org/0000-0003-4378-221X","observed_orcids":["https://orcid.org/0000-0003-4378-221X"]},"institutions":[],"countries":[],"is_corresponding":false,"raw_author_name":"S. Matsubara","raw_affiliation_strings":[],"raw_orcid":null,"affiliations":[]},{"author_position":"middle","author":{"id":null,"display_name":"I. Sato","orcid":null,"observed_orcids":[]},"institutions":[],"countries":[],"is_corresponding":false,"raw_author_name":"I. Sato","raw_affiliation_strings":[],"raw_orcid":null,"affiliations":[]},{"author_position":"middle","author":{"id":"https://openalex.org/A5038274081","display_name":"Masaru Suzuki","orcid":"https://orcid.org/0000-0003-0964-5289","observed_orcids":["https://orcid.org/0000-0003-0964-5289"]},"institutions":[],"countries":[],"is_corresponding":false,"raw_author_name":"M. Suzuki","raw_affiliation_strings":[],"raw_orcid":null,"affiliations":[]},{"author_position":"last","author":{"id":"https://openalex.org/A5089694584","display_name":"Hisanori Minakami","orcid":"https://orcid.org/0000-0002-6761-7502","observed_orcids":["https://orcid.org/0000-0002-6761-7502"]},"institutions":[],"countries":[],"is_corresponding":false,"raw_author_name":"H. Minakami","raw_affiliation_strings":[],"raw_orcid":null,"affiliations":[]}],"institutions":[],"countries_distinct_count":1,"institutions_distinct_count":2,"corresponding_author_ids":[],"corresponding_institution_ids":[],"apc_list":{"value":0,"currency":"EUR","value_usd":0},"apc_paid":null,"fwci":3.2277,"has_fulltext":false,"cited_by_count":83,"citation_normalized_percentile":{"value":0.91013877,"is_in_top_1_percent":false,"is_in_top_10_percent":true},"cited_by_percentile_year":{"min":88,"max":98},"biblio":{"volume":"31","issue":"3","first_page":"209","last_page":"15"},"is_retracted":false,"is_paratext":false,"is_xpac":false,"primary_topic":{"id":"https://openalex.org/T11389","display_name":"Maternal and fetal healthcare","score":0.9688000082969666,"subfield":{"id":"https://openalex.org/subfields/2735","display_name":"Pediatrics, Perinatology and Child Health"},"field":{"id":"https://openalex.org/fields/27","display_name":"Medicine"},"domain":{"id":"https://openalex.org/domains/4","display_name":"Health Sciences"}},"topics":[{"id":"https://openalex.org/T11389","display_name":"Maternal and fetal healthcare","score":0.9688000082969666,"subfield":{"id":"https://openalex.org/subfields/2735","display_name":"Pediatrics, Perinatology and Child Health"},"field":{"id":"https://openalex.org/fields/27","display_name":"Medicine"},"domain":{"id":"https://openalex.org/domains/4","display_name":"Health Sciences"}},{"id":"https://openalex.org/T10453","display_name":"Maternal and Perinatal Health Interventions","score":0.02319999970495701,"subfield":{"id":"https://openalex.org/subfields/2729","display_name":"Obstetrics and Gynecology"},"field":{"id":"https://openalex.org/fields/27","display_name":"Medicine"},"domain":{"id":"https://openalex.org/domains/4","display_name":"Health Sciences"}},{"id":"https://openalex.org/T10693","display_name":"Blood transfusion and management","score":0.001500000013038516,"subfield":{"id":"https://openalex.org/subfields/2720","display_name":"Hematology"},"field":{"id":"https://openalex.org/fields/27","display_name":"Medicine"},"domain":{"id":"https://openalex.org/domains/4","display_name":"Health Sciences"}}],"keywords":[{"id":"https://openalex.org/keywords/maternal-age","display_name":"maternal age","score":0.9829999804496765},{"id":"https://openalex.org/keywords/postpartum-hemorrhage","display_name":"postpartum hemorrhage","score":0.8920000195503235},{"id":"https://openalex.org/keywords/risk-factors","display_name":"risk factors","score":0.7429999709129333},{"id":"https://openalex.org/keywords/cesarean-section","display_name":"cesarean section","score":0.8840000033378601},{"id":"https://openalex.org/keywords/vaginal-delivery","display_name":"vaginal delivery","score":0.9959999918937683},{"id":"https://openalex.org/keywords/placenta-previa","display_name":"placenta previa","score":0.9409999847412109},{"id":"https://openalex.org/keywords/low-lying-placenta","display_name":"low-lying placenta","score":0.8880000114440918},{"id":"https://openalex.org/keywords/uterine-fibroids","display_name":"uterine fibroids","score":0.8949999809265137},{"id":"https://openalex.org/keywords/previous-cesarean-section","display_name":"previous cesarean section","score":0.7870000004768372},{"id":"https://openalex.org/keywords/instrumental-delivery","display_name":"instrumental delivery","score":0.8889999985694885},{"id":"https://openalex.org/keywords/primiparity","display_name":"primiparity","score":0.968999981880188}],"concepts":[{"id":"https://openalex.org/C71924100","wikidata":"https://www.wikidata.org/wiki/Q11190","display_name":"Medicine","level":0,"score":0.9289748072624207},{"id":"https://openalex.org/C2780081364","wikidata":"https://www.wikidata.org/wiki/Q1471410","display_name":"Placenta previa","level":5,"score":0.832726001739502},{"id":"https://openalex.org/C131872663","wikidata":"https://www.wikidata.org/wiki/Q5284418","display_name":"Obstetrics","level":1,"score":0.7266268134117126},{"id":"https://openalex.org/C156957248","wikidata":"https://www.wikidata.org/wiki/Q1862216","display_name":"Odds ratio","level":2,"score":0.6444512605667114},{"id":"https://openalex.org/C2778408130","wikidata":"https://www.wikidata.org/wiki/Q6679974","display_name":"Vaginal delivery","level":3,"score":0.5638982057571411},{"id":"https://openalex.org/C2991743468","wikidata":"https://www.wikidata.org/wiki/Q166019","display_name":"Blood loss","level":2,"score":0.5571867823600769},{"id":"https://openalex.org/C50440223","wikidata":"https://www.wikidata.org/wiki/Q1475848","display_name":"Risk factor","level":2,"score":0.5484843254089355},{"id":"https://openalex.org/C2776953305","wikidata":"https://www.wikidata.org/wiki/Q1212935","display_name":"Placenta","level":4,"score":0.5074407458305359},{"id":"https://openalex.org/C38180746","wikidata":"https://www.wikidata.org/wiki/Q1952580","display_name":"Multivariate analysis","level":2,"score":0.49097850918769836},{"id":"https://openalex.org/C29456083","wikidata":"https://www.wikidata.org/wiki/Q1221899","display_name":"Gynecology","level":1,"score":0.47392043471336365},{"id":"https://openalex.org/C2779234561","wikidata":"https://www.wikidata.org/wiki/Q11995","display_name":"Pregnancy","level":2,"score":0.43062078952789307},{"id":"https://openalex.org/C172680121","wikidata":"https://www.wikidata.org/wiki/Q26513","display_name":"Fetus","level":3,"score":0.2529221177101135},{"id":"https://openalex.org/C141071460","wikidata":"https://www.wikidata.org/wiki/Q40821","display_name":"Surgery","level":1,"score":0.1775345802307129},{"id":"https://openalex.org/C126322002","wikidata":"https://www.wikidata.org/wiki/Q11180","display_name":"Internal medicine","level":1,"score":0.11875003576278687},{"id":"https://openalex.org/C86803240","wikidata":"https://www.wikidata.org/wiki/Q420","display_name":"Biology","level":0,"score":0.0},{"id":"https://openalex.org/C54355233","wikidata":"https://www.wikidata.org/wiki/Q7162","display_name":"Genetics","level":1,"score":0.0}],"mesh":[{"descriptor_ui":"D000328","descriptor_name":"Adult","qualifier_ui":null,"qualifier_name":null,"is_major_topic":false},{"descriptor_ui":"D000704","descriptor_name":"Analysis of Variance","qualifier_ui":null,"qualifier_name":null,"is_major_topic":false},{"descriptor_ui":"D001803","descriptor_name":"Blood Transfusion","qualifier_ui":null,"qualifier_name":null,"is_major_topic":false},{"descriptor_ui":"D002585","descriptor_name":"Cesarean Section","qualifier_ui":null,"qualifier_name":null,"is_major_topic":false},{"descriptor_ui":"D005260","descriptor_name":"Female","qualifier_ui":null,"qualifier_name":null,"is_major_topic":false},{"descriptor_ui":"D006406","descriptor_name":"Hematoma","qualifier_ui":"Q000150","qualifier_name":"complications","is_major_topic":false},{"descriptor_ui":"D006473","descriptor_name":"Postpartum Hemorrhage","qualifier_ui":"Q000453","qualifier_name":"epidemiology","is_major_topic":true},{"descriptor_ui":"D006801","descriptor_name":"Humans","qualifier_ui":null,"qualifier_name":null,"is_major_topic":false},{"descriptor_ui":"D007889","descriptor_name":"Leiomyoma","qualifier_ui":"Q000150","qualifier_name":"complications","is_major_topic":false},{"descriptor_ui":"D008423","descriptor_name":"Maternal Age","qualifier_ui":null,"qualifier_name":null,"is_major_topic":true},{"descriptor_ui":"D010298","descriptor_name":"Parity","qualifier_ui":null,"qualifier_name":null,"is_major_topic":false},{"descriptor_ui":"D010920","descriptor_name":"Placenta","qualifier_ui":"Q000002","qualifier_name":"abnormalities","is_major_topic":false},{"descriptor_ui":"D011247","descriptor_name":"Pregnancy","qualifier_ui":null,"qualifier_name":null,"is_major_topic":false},{"descriptor_ui":"D011248","descriptor_name":"Pregnancy Complications","qualifier_ui":null,"qualifier_name":null,"is_major_topic":false},{"descriptor_ui":"D012189","descriptor_name":"Retrospective Studies","qualifier_ui":null,"qualifier_name":null,"is_major_topic":false},{"descriptor_ui":"D012307","descriptor_name":"Risk Factors","qualifier_ui":null,"qualifier_name":null,"is_major_topic":false},{"descriptor_ui":"D014594","descriptor_name":"Uterine Neoplasms","qualifier_ui":"Q000150","qualifier_name":"complications","is_major_topic":false},{"descriptor_ui":"D014597","descriptor_name":"Uterine Rupture","qualifier_ui":"Q000150","qualifier_name":"complications","is_major_topic":false},{"descriptor_ui":"D014599","descriptor_name":"Uterus","qualifier_ui":"Q000002","qualifier_name":"abnormalities","is_major_topic":false},{"descriptor_ui":"D016015","descriptor_name":"Logistic Models","qualifier_ui":null,"qualifier_name":null,"is_major_topic":false},{"descriptor_ui":"D016017","descriptor_name":"Odds Ratio","qualifier_ui":null,"qualifier_name":null,"is_major_topic":false},{"descriptor_ui":"D017604","descriptor_name":"Cesarean Section, Repeat","qualifier_ui":null,"qualifier_name":null,"is_major_topic":false},{"descriptor_ui":"D036861","descriptor_name":"Delivery, Obstetric","qualifier_ui":null,"qualifier_name":null,"is_major_topic":false}],"locations_count":2,"locations":[{"id":"doi:10.1515/jpm.2003.028","doi":"https://doi.org/10.1515/jpm.2003.028","is_oa":false,"landing_page_url":"https://doi.org/10.1515/jpm.2003.028","pdf_url":null,"source":{"id":"https://openalex.org/S61009040","display_name":"Journal of Perinatal Medicine","issn_l":"0300-5577","issn":["0300-5577","1619-3997"],"is_oa":false,"is_in_doaj":true,"is_core":true,"listed_in":["anvur-scientific","cwts-core","doaj","dongbi-c","doyens","jufo-1","ki-jl-1","medline","norway-1","poland-40","russia-white-list-1","vabb-shw"],"host_organization":"https://openalex.org/P4310313990","host_organization_name":"De Gruyter","host_organization_lineage":["https://openalex.org/P4310313990"],"host_organization_lineage_names":["De Gruyter"],"type":"journal"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Journal of Perinatal Medicine","raw_type":"journal-article"},{"id":"pmid:12825476","doi":null,"is_oa":false,"landing_page_url":"https://pubmed.ncbi.nlm.nih.gov/12825476","pdf_url":null,"source":{"id":"https://openalex.org/S4306525036","display_name":"PubMed","issn_l":null,"issn":null,"is_oa":false,"is_in_doaj":false,"is_core":false,"listed_in":[],"host_organization":"https://openalex.org/I1299303238","host_organization_name":"National Institutes of Health","host_organization_lineage":["https://openalex.org/I1299303238"],"host_organization_lineage_names":[],"type":"repository"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Journal of perinatal medicine","raw_type":"Journal Article"}],"best_oa_location":null,"sustainable_development_goals":[{"id":"https://metadata.un.org/sdg/3","score":0.9940000176429749,"display_name":"Good health and well-being"}],"study_designs":[{"id":"https://openalex.org/study-designs/observational-study","display_name":"Observational Study"}],"awards":[],"funders":[],"has_content":{"pdf":false,"grobid_xml":false},"content_urls":null,"referenced_works_count":12,"referenced_works":["https://openalex.org/W66329880","https://openalex.org/W158321768","https://openalex.org/W1971736657","https://openalex.org/W1976141273","https://openalex.org/W1991103099","https://openalex.org/W2023682552","https://openalex.org/W2039426543","https://openalex.org/W2076643002","https://openalex.org/W2094884080","https://openalex.org/W2121826252","https://openalex.org/W2143180186","https://openalex.org/W2403744384"],"related_works":["https://openalex.org/W4304003367","https://openalex.org/W2512499695","https://openalex.org/W2528629101","https://openalex.org/W4200110881","https://openalex.org/W2074454807","https://openalex.org/W2354813772","https://openalex.org/W2119986746","https://openalex.org/W7047780608","https://openalex.org/W3017906465","https://openalex.org/W2104019380"],"abstract_inverted_index":{"OBJECTIVE:":[0],"An":[1],"extensive":[2],"study":[3],"as":[4,47,200],"to":[5],"whether":[6],"maternal":[7,114,146,170],"age":[8,115,147,171],"itself":[9],"is":[10],"a":[11,28],"risk":[12,63,125,157,181],"factor":[13,182],"for":[14,40,54,87,127,159,183,196],"blood":[15,35,66,79,129,161,185],"loss":[16,36,67,80,130,162,186],"during":[17],"parturition.":[18],"METHOD:":[19],"A":[20,95,169],"total":[21],"of":[22,60,78,172,188,191],"10,053":[23],"consecutive":[24],"women":[25,41,88,132,164],"who":[26],"delivered":[27],"singleton":[29],"infant":[30],"were":[31,68,122,154],"studied.":[32],"The":[33,58,74],"excess":[34,128,160,184],"was":[37,81,178],"defined":[38],"separately":[39],"with":[42,89,133,165],"vaginal":[43,90,134],"and":[44,84,91,113,145,204],"cesarean":[45,92,104,166],"deliveries":[46],">":[48,116,148,173],"or":[49,117,149,174],"=":[50,118,150,175],"90th":[51,75],"centile":[52,76],"value":[53,77],"each":[55],"delivery":[56,107],"mode.":[57],"effects":[59],"13":[61],"potential":[62],"factors":[64,126,158],"on":[65],"analyzed":[69],"using":[70],"multivariate":[71],"analysis.":[72],"RESULTS:":[73],"615":[82],"ml":[83,86],"1,531":[85],"deliveries,":[93],"respectively.":[94],"low":[96,141,205],"lying":[97,142,206],"placenta":[98,143,202],"(odds":[99],"ratio":[100],"[OR],":[101],"4.4),":[102],"previous":[103],"(3.1),":[105],"operative":[106],"(2.6),":[108],"leiomyoma":[109,139],"(1.9),":[110],"primiparity":[111],"(1.6),":[112],"35":[119,151,176],"years":[120,152,177],"(1.5)":[121],"significant":[123,155],"independent":[124,156,180],"in":[131,163],"delivery.":[135],"Placenta":[136],"previa":[137],"(6.3),":[138],"(3.6),":[140],"(3.3),":[144],"(1.8)":[153],"sections.":[167],"CONCLUSION:":[168],"an":[179],"irrespective":[187],"the":[189],"mode":[190],"delivery,":[192],"even":[193],"after":[194],"adjusting":[195],"age-related":[197],"complications":[198],"such":[199],"leiomyoma,":[201],"previa,":[203],"placenta.":[207]},"counts_by_year":[{"year":2026,"cited_by_count":1},{"year":2025,"cited_by_count":3},{"year":2023,"cited_by_count":4},{"year":2020,"cited_by_count":2},{"year":2019,"cited_by_count":1},{"year":2018,"cited_by_count":4},{"year":2017,"cited_by_count":4},{"year":2016,"cited_by_count":5},{"year":2015,"cited_by_count":3},{"year":2014,"cited_by_count":6},{"year":2013,"cited_by_count":6},{"year":2012,"cited_by_count":6}],"updated_date":"2026-11-04T10:54:05.112534","created_date":"2016-06-24T00:00:00"}