Editing Miscarriage (section)

==Epidemiology==
Around 15% of known pregnancies end in miscarriage, totaling around 23 million miscarriages per year worldwide.<ref name=Quenby2021>{{cite journal |vauthors=Quenby S, Gallos ID, Dhillon-Smith RK, Podesek M, et al |title=Miscarriage matters: the epidemiological, physical, psychological, and economic costs of early pregnancy loss |journal=Lancet |volume=397 |issue=10285 |pages=1658–1667 |date=May 2021 |pmid=33915094 |doi=10.1016/S0140-6736(21)00682-6 |url=}}</ref> Miscarriage rates among all [[Human fertilization|fertilized zygotes]] are around 30% to 50%.<ref name="John20122" /><ref name="NIH2013Epi2" /><ref name=Will2013 /><ref name="jeve" /> A 2012 review found the risk of miscarriage between 5 and 20 weeks from 11% to 22%.<ref name=Avalos-2012 /> Up to the 13th week of pregnancy, the risk of miscarriage each week was around 2%, dropping to 1% in week 14 and reducing slowly between 14 and 20 weeks.<ref name=Avalos-2012 />

The precise rate is not known because a large number of miscarriages occur before pregnancies become established and before the woman is aware she is pregnant.<ref name="Avalos-2012">{{cite journal | vauthors = Ammon Avalos L, Galindo C, Li DK | title = A systematic review to calculate background miscarriage rates using life table analysis | journal = Birth Defects Research. Part A, Clinical and Molecular Teratology | volume = 94 | issue = 6 | pages = 417–23 | date = June 2012 | pmid = 22511535 | doi = 10.1002/bdra.23014 }}</ref> Additionally, those with bleeding in early pregnancy may seek medical care more often than those not experiencing bleeding.<ref name="Avalos-2012" /> Although some studies attempt to account for this by recruiting women who are planning pregnancies and testing for very early pregnancy, they still are not representative of the wider population.<ref name="Avalos-2012" />

In 2010, 50,000 inpatient admissions for miscarriage occurred in the UK.<ref name="radford" />