Editing Infertility (section)

==Epidemiology==
Prevalence of infertility varies depending on the definition, i.e., on the period involved in the failure to conceive.
* Infertility rates have increased by 4% since the 1980s, mostly from problems with [[fecundity]] due to an increase in age.<ref>{{cite book| vauthors = Maheshwari A |title=Human Reproduction|year=2008|pages=538–542}}</ref>
* Fertility problems affect one in seven couples in the UK. Most couples (about 84%) who have regular sexual intercourse (that is, every two to three days) and who do not use contraception get pregnant within a year. About 95 out of 100 couples who are trying to get pregnant do so within two years.<ref>{{cite journal | vauthors = Taylor A | title = ABC of subfertility: extent of the problem | journal = BMJ | volume = 327 | issue = 7412 | pages = 434–436 | date = August 2003 | pmid = 12933733 | pmc = 188498 | doi = 10.1136/bmj.327.7412.434 }}</ref>
* Women become less fertile as they get older. For women aged 35, about 94% who have regular unprotected sexual intercourse get pregnant after three years of trying. For women aged 38, however, only about 77%. The effect of age upon men's fertility is less clear.<ref>{{cite journal | vauthors = Zitzmann M | title = Effects of age on male fertility | journal = Best Practice & Research. Clinical Endocrinology & Metabolism | volume = 27 | issue = 4 | pages = 617–628 | date = August 2013 | pmid = 24054934 | doi = 10.1016/j.beem.2013.07.004 }}</ref>
* In people going forward for IVF in the UK, roughly half of fertility problems with a diagnosed cause are due to problems with the man, and about half due to problems with the woman. However, about one in five cases of infertility has no diagnosed cause.<ref>{{Cite web |url=http://www.hfea.gov.uk/en/1215.html |title=HFEA Chart on reasons for infertility |access-date=2 June 2008 |archive-url=https://web.archive.org/web/20080530020441/http://www.hfea.gov.uk/en/1215.html#Reasons_for_infertility |archive-date=30 May 2008 |url-status=dead}}</ref>
* In Britain, male factor infertility accounts for 25% of infertile couples, while 25% remain unexplained. 50% are female causes, with 25% being due to [[anovulation]] and 25% tubal problems/other.<ref>{{cite book | vauthors = Khan K, Gupta JK, Mires G |title=Core clinical cases in obstetrics and gynaecology: a problem-solving approach |publisher=Hodder Arnold |location=London |year=2005 |page=152 |isbn=978-0-340-81672-1 }}</ref>
* In Sweden, approximately 10% of couples wanting children are infertile.<ref>{{cite web | work = Sahlgrenska University Hospital | language = Swedish | title = Till spermadonator | trans-title = To sperm donators | url = http://sahlgrenska.se/upload/SU/omrade_oss/reproduktionsmedicin/Spermadonatorinformation.pdf | quote = Cirka 10% av alla par har problem med ofrivillig barnlöshet. | trans-quote = About 10% of all couples have problems with involuntary childlessness.| archive-url = https://web.archive.org/web/20080626045746/http://sahlgrenska.se/upload/SU/omrade_oss/reproduktionsmedicin/Spermadonatorinformation.pdf | archive-date=26 June 2008 }})</ref> In approximately one-third of these cases, the man is the factor, in one-third the woman is the factor, and in the remaining third the infertility is a product of factors on both parts.
* In many lower-income countries, estimating infertility is difficult due to incomplete information and [[infertility and childlessness stigmas]].
* Data on income-limited individuals, male infertility, and fertility within non-traditional families may be limited due to traditional social norms. Historical data on fertility and infertility are limited, as any form of study or tracking only began in the early 20th century. Per one account, "The invisibility of marginalised social groups in infertility tracking reflects broader social beliefs about who can and should reproduce. The offspring of privileged social groups are seen as a boon to society. The offspring of marginalised groups are perceived as a burden."<ref>{{Cite web |last1=Barnes |first1=Liberty |last2=Fledderjohann |first2=Jasmine |date=2017-12-07 |title=The invisible infertile: how cultural beliefs can shape statistics |url=https://theconversation.com/amp/the-invisible-infertile-how-cultural-beliefs-can-shape-statistics-87047 |access-date=2023-04-13 |website=theconversation.com}}</ref>