Answer

 

a) 60%

Source: N. Maconochie, P. Doyle, S. Prior, R. Simmons, “Risk factors for first trimester miscarriage—results from a UK-population-based case–control study,” BJOG: An International Journal of Obstetrics & Gynaecology, Dec 2006. Abstract available at www.blackwell-synergy.com.

 

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