Sex ratio and time to pregnancy: analysis of four large European population surveys
Objective To test whether the secondary sex ratio (proportion of male births) is associated with time to pregnancy, a marker of fertility. Design Analysis of four large population surveys.Setting Denmark and the United Kingdom.Participants 49 506 pregnancies.Main outcome measure Secondary sex ratio....
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| Veröffentlicht in: | BMJ 2007-03, Vol.334 (7592), p.524-526 |
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| creator | Joffe, Mike Bennett, James Best, Nicky Jensen, Tina Kold |
| description | Objective To test whether the secondary sex ratio (proportion of male births) is associated with time to pregnancy, a marker of fertility. Design Analysis of four large population surveys.Setting Denmark and the United Kingdom.Participants 49 506 pregnancies.Main outcome measure Secondary sex ratio. Results No association was found between the sex ratio and time to pregnancy and no discernible trend was found for sex ratio with time to pregnancy, either within individual datasets or in the pooled analysis. The odds ratios were 0.97 (95% confidence interval 0.90 to 1.04) for contraceptive failures, 1.01 (0.96 to 1.05) for time to pregnancy of 2-4 months, 1.02 (0.97 to 1.08) for 5-10 months, 0.98 (0.93 to 1.03) for 11 months or more, and 0.88 (0.74 to 1.06) for fertility treatment, with 0-1 months as the reference category.Conclusion No association was found between the secondary sex ratio and time to pregnancy. |
| doi_str_mv | 10.1136/bmj.39097.508426.BE |
| format | Article |
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Design Analysis of four large population surveys.Setting Denmark and the United Kingdom.Participants 49 506 pregnancies.Main outcome measure Secondary sex ratio. Results No association was found between the sex ratio and time to pregnancy and no discernible trend was found for sex ratio with time to pregnancy, either within individual datasets or in the pooled analysis. The odds ratios were 0.97 (95% confidence interval 0.90 to 1.04) for contraceptive failures, 1.01 (0.96 to 1.05) for time to pregnancy of 2-4 months, 1.02 (0.97 to 1.08) for 5-10 months, 0.98 (0.93 to 1.03) for 11 months or more, and 0.88 (0.74 to 1.06) for fertility treatment, with 0-1 months as the reference category.Conclusion No association was found between the secondary sex ratio and time to pregnancy.</description><edition>International edition</edition><identifier>ISSN: 0959-8138</identifier><identifier>ISSN: 0959-8146</identifier><identifier>ISSN: 0959-535X</identifier><identifier>ISSN: 1756-1833</identifier><identifier>EISSN: 1468-5833</identifier><identifier>EISSN: 1756-1833</identifier><identifier>DOI: 10.1136/bmj.39097.508426.BE</identifier><identifier>PMID: 17277014</identifier><identifier>CODEN: BMJOAE</identifier><language>eng</language><publisher>London: British Medical Journal Publishing Group</publisher><subject>Biological and medical sciences ; Birth control ; Births ; Chemical hazards ; Childbirth & labor ; Cohort studies ; Confidence interval ; Datasets ; Denmark ; Europe ; Female ; Fertility ; Fertility - physiology ; Gender ; General aspects ; Humans ; Male fertility ; Medical sciences ; Miscellaneous ; Population ; Population Surveillance ; Pregnancy ; Pregnancy - statistics & numerical data ; Public health. Hygiene ; Public health. Hygiene-occupational medicine ; Questionnaires ; Ratios ; Reproductive health ; Semen analysis ; Sex Ratio ; Sex ratios ; Time Factors</subject><ispartof>BMJ, 2007-03, Vol.334 (7592), p.524-526</ispartof><rights>BMJ Publishing Group Ltd 2007</rights><rights>Copyright 2007 BMJ Publishing Group Ltd.</rights><rights>2007 INIST-CNRS</rights><rights>Copyright: 2007 (c) BMJ Publishing Group Ltd 2007</rights><rights>Copyright BMJ Publishing Group Mar 10, 2007</rights><rights>BMJ Publishing Group Ltd 2007 2007 BMJ Publishing Group Ltd</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-b618t-8890136977c3cd7f6f46f6f4bb3ca3d84a7c689976a50bf6a2c32615d95acd753</citedby></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttp://bmj.com/content/334/7592/524.full.pdf$$EPDF$$P50$$Gbmj$$H</linktopdf><linktohtml>$$Uhttp://bmj.com/content/334/7592/524.full$$EHTML$$P50$$Gbmj$$H</linktohtml><link.rule.ids>114,115,230,314,776,780,799,881,3183,23550,27901,27902,30976,30977,57992,58225,77343,77374</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=18578420$$DView record in Pascal Francis$$Hfree_for_read</backlink><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/17277014$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>Joffe, Mike</creatorcontrib><creatorcontrib>Bennett, James</creatorcontrib><creatorcontrib>Best, Nicky</creatorcontrib><creatorcontrib>Jensen, Tina Kold</creatorcontrib><title>Sex ratio and time to pregnancy: analysis of four large European population surveys</title><title>BMJ</title><addtitle>BMJ</addtitle><description>Objective To test whether the secondary sex ratio (proportion of male births) is associated with time to pregnancy, a marker of fertility. Design Analysis of four large population surveys.Setting Denmark and the United Kingdom.Participants 49 506 pregnancies.Main outcome measure Secondary sex ratio. Results No association was found between the sex ratio and time to pregnancy and no discernible trend was found for sex ratio with time to pregnancy, either within individual datasets or in the pooled analysis. The odds ratios were 0.97 (95% confidence interval 0.90 to 1.04) for contraceptive failures, 1.01 (0.96 to 1.05) for time to pregnancy of 2-4 months, 1.02 (0.97 to 1.08) for 5-10 months, 0.98 (0.93 to 1.03) for 11 months or more, and 0.88 (0.74 to 1.06) for fertility treatment, with 0-1 months as the reference category.Conclusion No association was found between the secondary sex ratio and time to pregnancy.</description><subject>Biological and medical sciences</subject><subject>Birth control</subject><subject>Births</subject><subject>Chemical hazards</subject><subject>Childbirth & labor</subject><subject>Cohort studies</subject><subject>Confidence interval</subject><subject>Datasets</subject><subject>Denmark</subject><subject>Europe</subject><subject>Female</subject><subject>Fertility</subject><subject>Fertility - physiology</subject><subject>Gender</subject><subject>General aspects</subject><subject>Humans</subject><subject>Male fertility</subject><subject>Medical sciences</subject><subject>Miscellaneous</subject><subject>Population</subject><subject>Population Surveillance</subject><subject>Pregnancy</subject><subject>Pregnancy - statistics & numerical data</subject><subject>Public health. Hygiene</subject><subject>Public health. Hygiene-occupational medicine</subject><subject>Questionnaires</subject><subject>Ratios</subject><subject>Reproductive health</subject><subject>Semen analysis</subject><subject>Sex Ratio</subject><subject>Sex ratios</subject><subject>Time Factors</subject><issn>0959-8138</issn><issn>0959-8146</issn><issn>0959-535X</issn><issn>1756-1833</issn><issn>1468-5833</issn><issn>1756-1833</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2007</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><sourceid>8G5</sourceid><sourceid>BENPR</sourceid><sourceid>GUQSH</sourceid><sourceid>M2O</sourceid><sourceid>7QJ</sourceid><recordid>eNqNkl2L1DAUhoMo7rDuLxAlKHrXmo_may8Ed5xRcVBh1duQtunYsW1q0i47_950O8yqIHqTQN4nL-e85wDwEKMUY8pf5O0upQopkTIkM8LTi9UdsMAZlwmTlN4FC6SYSiSm8gSchbBDCBEqpOLsPjjBggiBcLYAl5f2Gnoz1A6aroRD3Vo4ONh7u-1MV-zP47Np9qEO0FWwcqOHjfFbC1ejd701HexdPzaTQQfD6K_sPjwA9yrTBHt2uE_Bl_Xq8_Jtsvn45t3y1SbJOZZDIqVCsRUlREGLUlS8yvh05DktDC1lZkTBpVKCG4byihtSUMIxKxUzkWf0FLycffsxb21Z2G7wptG9r1vj99qZWv-udPU3vXVXGkusMsmjwfODgXc_RhsG3dahsE1jOuvGoAUiGSWxyH-BTGCFMiQj-OQPcBcjiwkGTSKAlSJT3U__BmEhhFJYEhopOlOFdyF4Wx0bw0hPO6DjDuibHdDzDuiLVfz1-NdMbv8cJh6BZwfAhMI0lY9TrsMtJ5mIXihyj2ZuFwbnjzpBDHF-E0ky63UY7PVRN_675oIKpj98Xer1Wr1HnzZYv458OvNT1f_TyU_xY-Cm</recordid><startdate>20070310</startdate><enddate>20070310</enddate><creator>Joffe, Mike</creator><creator>Bennett, James</creator><creator>Best, Nicky</creator><creator>Jensen, Tina Kold</creator><general>British Medical Journal Publishing Group</general><general>British Medical Association</general><general>BMJ Publishing Group LTD</general><general>BMJ Publishing Group</general><general>BMJ Publishing Group Ltd</general><scope>BSCLL</scope><scope>IQODW</scope><scope>CGR</scope><scope>CUY</scope><scope>CVF</scope><scope>ECM</scope><scope>EIF</scope><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>3V.</scope><scope>7X7</scope><scope>7XB</scope><scope>88I</scope><scope>8AF</scope><scope>8FE</scope><scope>8FH</scope><scope>8FI</scope><scope>8FJ</scope><scope>8FK</scope><scope>8G5</scope><scope>ABUWG</scope><scope>AFKRA</scope><scope>ASE</scope><scope>AZQEC</scope><scope>BBNVY</scope><scope>BENPR</scope><scope>BHPHI</scope><scope>BTHHO</scope><scope>CCPQU</scope><scope>DWQXO</scope><scope>FPQ</scope><scope>FYUFA</scope><scope>GHDGH</scope><scope>GNUQQ</scope><scope>GUQSH</scope><scope>HCIFZ</scope><scope>K6X</scope><scope>K9.</scope><scope>LK8</scope><scope>M2O</scope><scope>M2P</scope><scope>M7P</scope><scope>MBDVC</scope><scope>PQEST</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>PRINS</scope><scope>Q9U</scope><scope>7QJ</scope><scope>7X8</scope><scope>5PM</scope></search><sort><creationdate>20070310</creationdate><title>Sex ratio and time to pregnancy: analysis of four large European population surveys</title><author>Joffe, Mike ; Bennett, James ; Best, Nicky ; Jensen, Tina Kold</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-b618t-8890136977c3cd7f6f46f6f4bb3ca3d84a7c689976a50bf6a2c32615d95acd753</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2007</creationdate><topic>Biological and medical sciences</topic><topic>Birth control</topic><topic>Births</topic><topic>Chemical hazards</topic><topic>Childbirth & labor</topic><topic>Cohort studies</topic><topic>Confidence interval</topic><topic>Datasets</topic><topic>Denmark</topic><topic>Europe</topic><topic>Female</topic><topic>Fertility</topic><topic>Fertility - physiology</topic><topic>Gender</topic><topic>General aspects</topic><topic>Humans</topic><topic>Male fertility</topic><topic>Medical sciences</topic><topic>Miscellaneous</topic><topic>Population</topic><topic>Population Surveillance</topic><topic>Pregnancy</topic><topic>Pregnancy - statistics & numerical data</topic><topic>Public health. Hygiene</topic><topic>Public health. Hygiene-occupational medicine</topic><topic>Questionnaires</topic><topic>Ratios</topic><topic>Reproductive health</topic><topic>Semen analysis</topic><topic>Sex Ratio</topic><topic>Sex ratios</topic><topic>Time Factors</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Joffe, Mike</creatorcontrib><creatorcontrib>Bennett, James</creatorcontrib><creatorcontrib>Best, Nicky</creatorcontrib><creatorcontrib>Jensen, Tina Kold</creatorcontrib><collection>Istex</collection><collection>Pascal-Francis</collection><collection>Medline</collection><collection>MEDLINE</collection><collection>MEDLINE (Ovid)</collection><collection>MEDLINE</collection><collection>MEDLINE</collection><collection>PubMed</collection><collection>CrossRef</collection><collection>ProQuest Central (Corporate)</collection><collection>Health & Medical Collection</collection><collection>ProQuest Central (purchase pre-March 2016)</collection><collection>Science Database (Alumni Edition)</collection><collection>STEM Database</collection><collection>ProQuest SciTech Collection</collection><collection>ProQuest Natural Science Collection</collection><collection>Hospital Premium Collection</collection><collection>Hospital Premium Collection (Alumni Edition)</collection><collection>ProQuest Central (Alumni) (purchase pre-March 2016)</collection><collection>Research Library (Alumni Edition)</collection><collection>ProQuest Central (Alumni Edition)</collection><collection>ProQuest Central UK/Ireland</collection><collection>British Nursing Index</collection><collection>ProQuest Central Essentials</collection><collection>Biological Science Collection</collection><collection>ProQuest Central</collection><collection>Natural Science Collection</collection><collection>BMJ Journals</collection><collection>ProQuest One Community College</collection><collection>ProQuest Central Korea</collection><collection>British Nursing Index (BNI) (1985 to Present)</collection><collection>Health Research Premium Collection</collection><collection>Health Research Premium Collection (Alumni)</collection><collection>ProQuest Central Student</collection><collection>Research Library Prep</collection><collection>SciTech Premium Collection</collection><collection>British Nursing Index</collection><collection>ProQuest Health & Medical Complete (Alumni)</collection><collection>ProQuest Biological Science Collection</collection><collection>Research Library</collection><collection>Science Database</collection><collection>Biological Science Database</collection><collection>Research Library (Corporate)</collection><collection>ProQuest One Academic Eastern Edition (DO NOT USE)</collection><collection>ProQuest One Academic</collection><collection>ProQuest One Academic UKI Edition</collection><collection>ProQuest Central China</collection><collection>ProQuest Central Basic</collection><collection>Applied Social Sciences Index & Abstracts (ASSIA)</collection><collection>MEDLINE - Academic</collection><collection>PubMed Central (Full Participant titles)</collection><jtitle>BMJ</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Joffe, Mike</au><au>Bennett, James</au><au>Best, Nicky</au><au>Jensen, Tina Kold</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Sex ratio and time to pregnancy: analysis of four large European population surveys</atitle><jtitle>BMJ</jtitle><addtitle>BMJ</addtitle><date>2007-03-10</date><risdate>2007</risdate><volume>334</volume><issue>7592</issue><spage>524</spage><epage>526</epage><pages>524-526</pages><issn>0959-8138</issn><issn>0959-8146</issn><issn>0959-535X</issn><issn>1756-1833</issn><eissn>1468-5833</eissn><eissn>1756-1833</eissn><coden>BMJOAE</coden><abstract>Objective To test whether the secondary sex ratio (proportion of male births) is associated with time to pregnancy, a marker of fertility. Design Analysis of four large population surveys.Setting Denmark and the United Kingdom.Participants 49 506 pregnancies.Main outcome measure Secondary sex ratio. Results No association was found between the sex ratio and time to pregnancy and no discernible trend was found for sex ratio with time to pregnancy, either within individual datasets or in the pooled analysis. The odds ratios were 0.97 (95% confidence interval 0.90 to 1.04) for contraceptive failures, 1.01 (0.96 to 1.05) for time to pregnancy of 2-4 months, 1.02 (0.97 to 1.08) for 5-10 months, 0.98 (0.93 to 1.03) for 11 months or more, and 0.88 (0.74 to 1.06) for fertility treatment, with 0-1 months as the reference category.Conclusion No association was found between the secondary sex ratio and time to pregnancy.</abstract><cop>London</cop><pub>British Medical Journal Publishing Group</pub><pmid>17277014</pmid><doi>10.1136/bmj.39097.508426.BE</doi><tpages>3</tpages><edition>International edition</edition><oa>free_for_read</oa></addata></record> |
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| subjects | Biological and medical sciences Birth control Births Chemical hazards Childbirth & labor Cohort studies Confidence interval Datasets Denmark Europe Female Fertility Fertility - physiology Gender General aspects Humans Male fertility Medical sciences Miscellaneous Population Population Surveillance Pregnancy Pregnancy - statistics & numerical data Public health. Hygiene Public health. Hygiene-occupational medicine Questionnaires Ratios Reproductive health Semen analysis Sex Ratio Sex ratios Time Factors |
| title | Sex ratio and time to pregnancy: analysis of four large European population surveys |
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