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A whole new can of worms will undoubtedly be opened with the way this new study on pregnancy, early miscarriage, and socio-demographic, behavioural and other factors is being reported:
http://www.forbes.com/forbeslife/health/feeds/hscout/2006/12/04/hscout536393.html
(for example, "Women who weren't married or living with a partner had an increased risk of miscarriage." - wouldn't the religious right love to bray about *that*!)
The abstract is here:
http://www.blackwell-synergy.com/doi/abs/10.1111/j.1471-0528.2006.01193.x