{"id":"https://openalex.org/W4247426459","doi":"https://doi.org/10.22541/au.159284896.69658026","title":"Estimating time to pregnancy in Chinese couples: a population-based study","display_name":"Estimating time to pregnancy in Chinese couples: a population-based study","publication_year":2020,"publication_date":"2020-06-22","ids":{"openalex":"https://openalex.org/W4247426459","doi":"https://doi.org/10.22541/au.159284896.69658026"},"language":"en","primary_location":{"id":"doi:10.22541/au.159284896.69658026","doi":"https://doi.org/10.22541/au.159284896.69658026","is_oa":true,"landing_page_url":"https://doi.org/10.22541/au.159284896.69658026","pdf_url":"https://www.authorea.com/doi/pdf/10.22541/au.159284896.69658026","source":null,"license":null,"license_id":null,"version":"acceptedVersion","is_accepted":true,"is_published":false,"raw_source_name":null,"raw_type":"posted-content"},"volume":null,"type":"preprint","indexed_in":["crossref"],"open_access":{"is_oa":true,"oa_status":"green","oa_url":"https://www.authorea.com/doi/pdf/10.22541/au.159284896.69658026","any_repository_has_fulltext":null},"authorships":[{"author_position":"first","author":{"id":null,"display_name":"Danni Zheng","orcid":null,"observed_orcids":[]},"institutions":[{"id":"https://openalex.org/I4210141942","display_name":"Peking University Third Hospital","ror":"https://ror.org/04wwqze12","country_code":"CN","type":"healthcare","lineage":["https://openalex.org/I4210141942"]}],"countries":["CN"],"is_corresponding":false,"raw_author_name":"Danni Zheng","raw_affiliation_strings":["Peking University Third Hospital"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Peking University Third Hospital","institution_ids":["https://openalex.org/I4210141942"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5090420285","display_name":"Zehong Zhou","orcid":"https://orcid.org/0000-0002-0612-1204","observed_orcids":["https://orcid.org/0000-0002-0612-1204"]},"institutions":[{"id":"https://openalex.org/I4210105982","display_name":"Guangzhou Women and Children Medical Center","ror":"https://ror.org/01g53at17","country_code":"CN","type":"healthcare","lineage":["https://openalex.org/I4210105982"]}],"countries":["CN"],"is_corresponding":false,"raw_author_name":"Zehong Zhou","raw_affiliation_strings":["Guangzhou Women and Children's Medical Center"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Guangzhou Women and Children's Medical Center","institution_ids":["https://openalex.org/I4210105982"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5100385064","display_name":"Rong Li","orcid":"https://orcid.org/0000-0003-0305-5579","observed_orcids":["https://orcid.org/0000-0003-0305-5579","https://orcid.org/0009-0007-3919-0920"]},"institutions":[],"countries":[],"is_corresponding":false,"raw_author_name":"Rong Li","raw_affiliation_strings":[],"raw_orcid":null,"affiliations":[]},{"author_position":"middle","author":{"id":null,"display_name":"Hongping Wu","orcid":null,"observed_orcids":[]},"institutions":[],"countries":[],"is_corresponding":false,"raw_author_name":"Hongping Wu","raw_affiliation_strings":[],"raw_orcid":null,"affiliations":[]},{"author_position":"middle","author":{"id":"https://openalex.org/A5102376402","display_name":"Suxin Xu","orcid":null,"observed_orcids":[]},"institutions":[],"countries":[],"is_corresponding":false,"raw_author_name":"Suxin Xu","raw_affiliation_strings":[],"raw_orcid":null,"affiliations":[]},{"author_position":"middle","author":{"id":"https://openalex.org/A5079072839","display_name":"Yuefan Kang","orcid":null,"observed_orcids":[]},"institutions":[],"countries":[],"is_corresponding":false,"raw_author_name":"Yuefan Kang","raw_affiliation_strings":[],"raw_orcid":null,"affiliations":[]},{"author_position":"middle","author":{"id":"https://openalex.org/A5101575373","display_name":"Yunxia Cao","orcid":"https://orcid.org/0000-0003-4218-6774","observed_orcids":["https://orcid.org/0000-0003-4218-6774"]},"institutions":[{"id":"https://openalex.org/I4210136596","display_name":"First Affiliated Hospital of Anhui Medical University","ror":"https://ror.org/03t1yn780","country_code":"CN","type":"healthcare","lineage":["https://openalex.org/I4210136596"]}],"countries":["CN"],"is_corresponding":false,"raw_author_name":"Yunxia Cao","raw_affiliation_strings":["The First Affiliated Hospital of Anhui Medical University"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"The First Affiliated Hospital of Anhui Medical University","institution_ids":["https://openalex.org/I4210136596"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5100768787","display_name":"Xiujuan Chen","orcid":"https://orcid.org/0000-0003-1040-9937","observed_orcids":["https://orcid.org/0000-0003-1040-9937"]},"institutions":[],"countries":[],"is_corresponding":false,"raw_author_name":"Xiujuan Chen","raw_affiliation_strings":[],"raw_orcid":null,"affiliations":[]},{"author_position":"middle","author":{"id":"https://openalex.org/A5100540515","display_name":"Zhu Yimin","orcid":null,"observed_orcids":[]},"institutions":[],"countries":[],"is_corresponding":false,"raw_author_name":"Yimin Zhu","raw_affiliation_strings":[],"raw_orcid":null,"affiliations":[]},{"author_position":"middle","author":{"id":"https://openalex.org/A5100964681","display_name":"Shuguang Xu","orcid":null,"observed_orcids":[]},"institutions":[],"countries":[],"is_corresponding":false,"raw_author_name":"Shuguang Xu","raw_affiliation_strings":[],"raw_orcid":null,"affiliations":[]},{"author_position":"middle","author":{"id":"https://openalex.org/A5108064842","display_name":"Zi\u2010Jiang Chen","orcid":"https://orcid.org/0000-0001-6637-6631","observed_orcids":["https://orcid.org/0000-0001-6637-6631"]},"institutions":[{"id":"https://openalex.org/I154099455","display_name":"Shandong University","ror":"https://ror.org/0207yh398","country_code":"CN","type":"education","lineage":["https://openalex.org/I154099455"]},{"id":"https://openalex.org/I4210116517","display_name":"Shandong Provincial Hospital","ror":"https://ror.org/02ar2nf05","country_code":"CN","type":"healthcare","lineage":["https://openalex.org/I4210116517"]}],"countries":["CN"],"is_corresponding":false,"raw_author_name":"Zi-Jiang Chen","raw_affiliation_strings":["Shandong Provincial Hospital Affiliated to Shandong University"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Shandong Provincial Hospital Affiliated to Shandong University","institution_ids":["https://openalex.org/I154099455","https://openalex.org/I4210116517"]}]},{"author_position":"last","author":{"id":"https://openalex.org/A5003517853","display_name":"Jie Qiao","orcid":"https://orcid.org/0000-0003-2126-1376","observed_orcids":["https://orcid.org/0000-0003-2126-1376"]},"institutions":[{"id":"https://openalex.org/I4210141942","display_name":"Peking University Third Hospital","ror":"https://ror.org/04wwqze12","country_code":"CN","type":"healthcare","lineage":["https://openalex.org/I4210141942"]}],"countries":["CN"],"is_corresponding":false,"raw_author_name":"Jie Qiao","raw_affiliation_strings":["Peking University Third Hospital"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Peking University Third Hospital","institution_ids":["https://openalex.org/I4210141942"]}]}],"institutions":[],"countries_distinct_count":1,"institutions_distinct_count":5,"corresponding_author_ids":[],"corresponding_institution_ids":[],"apc_list":null,"apc_paid":null,"fwci":null,"has_fulltext":true,"cited_by_count":0,"citation_normalized_percentile":null,"cited_by_percentile_year":null,"biblio":{"volume":null,"issue":null,"first_page":null,"last_page":null},"is_retracted":false,"is_paratext":false,"is_xpac":false,"primary_topic":{"id":"https://openalex.org/T10600","display_name":"Reproductive Health and Contraception","score":0.975600004196167,"subfield":{"id":"https://openalex.org/subfields/2739","display_name":"Public Health, Environmental and Occupational 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/T10600","display_name":"Reproductive Health and Contraception","score":0.975600004196167,"subfield":{"id":"https://openalex.org/subfields/2739","display_name":"Public Health, Environmental and Occupational 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/T12728","display_name":"Demographic Trends and Gender Preferences","score":0.013100000098347664,"subfield":{"id":"https://openalex.org/subfields/3318","display_name":"Gender Studies"},"field":{"id":"https://openalex.org/fields/33","display_name":"Social Sciences"},"domain":{"id":"https://openalex.org/domains/2","display_name":"Social Sciences"}},{"id":"https://openalex.org/T11156","display_name":"Reproductive Health and Technologies","score":0.0052999998442828655,"subfield":{"id":"https://openalex.org/subfields/2743","display_name":"Reproductive Medicine"},"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/time-to-pregnancy","display_name":"time to pregnancy","score":0.9860000014305115},{"id":"https://openalex.org/keywords/fertility","display_name":"fertility","score":0.6669999957084656},{"id":"https://openalex.org/keywords/chinese-couples","display_name":"Chinese couples","score":0.6970000267028809},{"id":"https://openalex.org/keywords/age-at-conception","display_name":"age at conception","score":0.7009999752044678},{"id":"https://openalex.org/keywords/maternal-age","display_name":"maternal age","score":0.6940000057220459},{"id":"https://openalex.org/keywords/educational-attainment","display_name":"educational attainment","score":0.7419999837875366},{"id":"https://openalex.org/keywords/household-income","display_name":"household income","score":0.9829999804496765},{"id":"https://openalex.org/keywords/nulliparity","display_name":"nulliparity","score":0.9369999766349792},{"id":"https://openalex.org/keywords/cohabitation-duration","display_name":"cohabitation duration","score":0.8119999766349792}],"concepts":[{"id":"https://openalex.org/C2779234561","wikidata":"https://www.wikidata.org/wiki/Q11995","display_name":"Pregnancy","level":2,"score":0.7403245568275452},{"id":"https://openalex.org/C71924100","wikidata":"https://www.wikidata.org/wiki/Q11190","display_name":"Medicine","level":0,"score":0.6781754493713379},{"id":"https://openalex.org/C149923435","wikidata":"https://www.wikidata.org/wiki/Q37732","display_name":"Demography","level":1,"score":0.6471142768859863},{"id":"https://openalex.org/C2908647359","wikidata":"https://www.wikidata.org/wiki/Q2625603","display_name":"Population","level":2,"score":0.5485445261001587},{"id":"https://openalex.org/C122048520","wikidata":"https://www.wikidata.org/wiki/Q2913954","display_name":"Percentile","level":2,"score":0.5452308654785156},{"id":"https://openalex.org/C183380357","wikidata":"https://www.wikidata.org/wiki/Q1776598","display_name":"Cluster sampling","level":3,"score":0.5022099018096924},{"id":"https://openalex.org/C2779442300","wikidata":"https://www.wikidata.org/wiki/Q49800","display_name":"Cohabitation","level":2,"score":0.4916258454322815},{"id":"https://openalex.org/C49898467","wikidata":"https://www.wikidata.org/wiki/Q1517706","display_name":"Stratified sampling","level":2,"score":0.4862312376499176},{"id":"https://openalex.org/C44249647","wikidata":"https://www.wikidata.org/wiki/Q208498","display_name":"Confidence interval","level":2,"score":0.4854443669319153},{"id":"https://openalex.org/C142052008","wikidata":"https://www.wikidata.org/wiki/Q954027","display_name":"Cross-sectional study","level":2,"score":0.45365938544273376},{"id":"https://openalex.org/C131872663","wikidata":"https://www.wikidata.org/wiki/Q5284418","display_name":"Obstetrics","level":1,"score":0.42820677161216736},{"id":"https://openalex.org/C99454951","wikidata":"https://www.wikidata.org/wiki/Q932068","display_name":"Environmental health","level":1,"score":0.1613348126411438},{"id":"https://openalex.org/C205649164","wikidata":"https://www.wikidata.org/wiki/Q1071","display_name":"Geography","level":0,"score":0.15430277585983276},{"id":"https://openalex.org/C105795698","wikidata":"https://www.wikidata.org/wiki/Q12483","display_name":"Statistics","level":1,"score":0.08028021454811096},{"id":"https://openalex.org/C86803240","wikidata":"https://www.wikidata.org/wiki/Q420","display_name":"Biology","level":0,"score":0.0},{"id":"https://openalex.org/C126322002","wikidata":"https://www.wikidata.org/wiki/Q11180","display_name":"Internal medicine","level":1,"score":0.0},{"id":"https://openalex.org/C144024400","wikidata":"https://www.wikidata.org/wiki/Q21201","display_name":"Sociology","level":0,"score":0.0},{"id":"https://openalex.org/C166957645","wikidata":"https://www.wikidata.org/wiki/Q23498","display_name":"Archaeology","level":1,"score":0.0},{"id":"https://openalex.org/C54355233","wikidata":"https://www.wikidata.org/wiki/Q7162","display_name":"Genetics","level":1,"score":0.0},{"id":"https://openalex.org/C142724271","wikidata":"https://www.wikidata.org/wiki/Q7208","display_name":"Pathology","level":1,"score":0.0},{"id":"https://openalex.org/C33923547","wikidata":"https://www.wikidata.org/wiki/Q395","display_name":"Mathematics","level":0,"score":0.0}],"mesh":[],"locations_count":1,"locations":[{"id":"doi:10.22541/au.159284896.69658026","doi":"https://doi.org/10.22541/au.159284896.69658026","is_oa":true,"landing_page_url":"https://doi.org/10.22541/au.159284896.69658026","pdf_url":"https://www.authorea.com/doi/pdf/10.22541/au.159284896.69658026","source":null,"license":null,"license_id":null,"version":"acceptedVersion","is_accepted":true,"is_published":false,"raw_source_name":null,"raw_type":"posted-content"}],"best_oa_location":{"id":"doi:10.22541/au.159284896.69658026","doi":"https://doi.org/10.22541/au.159284896.69658026","is_oa":true,"landing_page_url":"https://doi.org/10.22541/au.159284896.69658026","pdf_url":"https://www.authorea.com/doi/pdf/10.22541/au.159284896.69658026","source":null,"license":null,"license_id":null,"version":"acceptedVersion","is_accepted":true,"is_published":false,"raw_source_name":null,"raw_type":"posted-content"},"sustainable_development_goals":[{"display_name":"Good health and well-being","score":0.9537000060081482,"id":"https://metadata.un.org/sdg/3"}],"study_designs":[{"display_name":"Observational Study","id":"https://openalex.org/study-designs/observational-study"}],"awards":[{"id":"https://openalex.org/G1276966604","display_name":null,"funder_award_id":"2016YFC1000201","funder_id":"https://openalex.org/F4320335777","funder_display_name":"National Key Research and Development Program of China"},{"id":"https://openalex.org/G7238378642","display_name":null,"funder_award_id":"2018YFC1002102","funder_id":"https://openalex.org/F4320335777","funder_display_name":"National Key Research and Development Program of China"}],"funders":[{"id":"https://openalex.org/F4320322735","display_name":"National Health and Family Planning Commission of the People's Republic of China","ror":"https://ror.org/052eegr76"},{"id":"https://openalex.org/F4320322927","display_name":"Zhejiang University","ror":"https://ror.org/00a2xv884"},{"id":"https://openalex.org/F4320335777","display_name":"National Key Research and Development Program of China","ror":null}],"has_content":{"pdf":true,"grobid_xml":true},"content_urls":{"pdf":"https://content.openalex.org/works/W4247426459.pdf","grobid_xml":"https://content.openalex.org/works/W4247426459.grobid-xml"},"referenced_works_count":32,"referenced_works":["https://openalex.org/W2009834502","https://openalex.org/W2015796819","https://openalex.org/W2028451908","https://openalex.org/W2030673372","https://openalex.org/W2048338212","https://openalex.org/W2055869166","https://openalex.org/W2062700021","https://openalex.org/W2065067996","https://openalex.org/W2068925756","https://openalex.org/W2071651860","https://openalex.org/W2079582713","https://openalex.org/W2106224369","https://openalex.org/W2106507263","https://openalex.org/W2108543157","https://openalex.org/W2114222248","https://openalex.org/W2120779101","https://openalex.org/W2121041187","https://openalex.org/W2124608202","https://openalex.org/W2125102812","https://openalex.org/W2129749274","https://openalex.org/W2132837482","https://openalex.org/W2137559449","https://openalex.org/W2138004410","https://openalex.org/W2156407943","https://openalex.org/W2164814768","https://openalex.org/W2211776884","https://openalex.org/W2340796757","https://openalex.org/W2762472682","https://openalex.org/W2790887288","https://openalex.org/W2793041320","https://openalex.org/W2953472093","https://openalex.org/W4246695376"],"related_works":["https://openalex.org/W2580468882","https://openalex.org/W2374309481","https://openalex.org/W116582471","https://openalex.org/W2394446746","https://openalex.org/W947828638","https://openalex.org/W7132691159","https://openalex.org/W7160038599","https://openalex.org/W778992813","https://openalex.org/W2969525415","https://openalex.org/W2065067996"],"abstract_inverted_index":{"Objective:":[0],"To":[1],"explore":[2],"the":[3,82,108,146,155,222],"distribution":[4],"of":[5,96,111,132,164,190,202,209,221,230],"time":[6,84,181,223],"to":[7,48,65,85,182,224],"pregnancy":[8,67,86,112,183,226],"in":[9,26,154,198],"a":[10,15,94,218],"Chinese":[11,228],"population":[12],"based":[13],"on":[14],"cross-sectional":[16,20],"design.":[17],"Design:":[18],"A":[19],"population-based":[21],"study.":[22],"Setting:":[23],"8":[24],"provinces/municipalities":[25],"China":[27],"between":[28],"2010":[29],"and":[30,58,117,123,129,141,145,161,173,212,241],"2011.":[31],"Population":[32],"or":[33],"Sample:":[34],"25,270":[35],"couples":[36,70,78,229],"aged":[37,104,134,166],"20-49":[38],"years.":[39],"Methods:":[40],"Multistage":[41],"stratified":[42],"cluster":[43],"sampling":[44],"strategy":[45],"was":[46,87],"utilized":[47],"recruit":[49],"participants":[50],"from":[51,68],"each":[52],"stratum":[53],"by":[54,149],"district,":[55],"province/municipality,":[56],"town/township,":[57],"village/street":[59],"order.":[60],"Main":[61],"Outcome":[62],"Measures:":[63],"Time":[64],"diagnose":[66,225],"17,275":[69],"\u201cat":[71],"risk":[72],"for":[73,80,236],"pregnancy\u201d.":[74],"Results:":[75],"In":[76],"7,889":[77],"eligible":[79],"analysis,":[81],"mean":[83],"17.2":[88],"months":[89,98,119],"(standard":[90],"deviation,":[91],"22.7)":[92],"with":[93,180],"median":[95],"9":[97],"(25\u201375th":[99],"percentile,":[100],"3\u201320":[101],"months).":[102],"Women":[103],"20\u201324":[105],"years":[106,136,168],"had":[107],"highest":[109],"percentage":[110,147],"at":[113],"3,":[114],"6,":[115],"12,":[116],"24":[118],"(23.9%,":[120],"42.5%,":[121],"58.5%,":[122],"80.4%,":[124],"respectively).":[125],"Furthermore,":[126],"55.8%":[127],"(3,413/6,116)":[128],"79.9%":[130],"(4,885/6,116)":[131],"women":[133,165],"<35":[135],"conceived":[137,169],"within":[138,170],"1":[139,171],"year":[140,172],"2":[142,174],"years,":[143,175],"respectively,":[144],"increased":[148],"only":[150],"8.4%":[151],"(5,399/6,116,":[152],"88.8%)":[153],"third":[156],"year.":[157],"Only":[158],"30.6%":[159],"(186/607)":[160],"50.6%":[162],"(307/607)":[163],"\u226535":[167],"respectively.":[176],"Risk":[177],"factors":[178],"associated":[179],"were":[184],"older":[185],"age,":[186,232],"lower":[187],"educational":[188],"attainment":[189],"couples,":[191],"higher":[192],"annual":[193],"household":[194],"income,":[195],"toxic":[196],"exposure":[197],"men,":[199],"shorter":[200],"duration":[201],"cohabitation,":[203],"longer":[204],"menstrual":[205],"cycle":[206],"interval,":[207],"history":[208],"abnormal":[210],"pregnancy,":[211],"nullipara.":[213],"Conclusions:":[214],"Our":[215],"study":[216],"provides":[217],"comprehensive":[219],"estimation":[220],"among":[227],"reproductive":[231],"providing":[233],"important":[234],"information":[235],"policy":[237],"makers,":[238],"fertility":[239],"clinicians,":[240],"sexual":[242],"health":[243],"educators.":[244]},"counts_by_year":[],"updated_date":"2026-10-28T10:33:24.094632","created_date":"2022-05-12T00:00:00"}