Here's the link to an interesting study done by one hospital in the UK. They get 200-300 JW maternity patients a year. The patients who refuse blood transfusion have a mortality rate 100x that of women who do not refuse blood transfusions! 1 death per 1000 for JW maternity patients. 1 death per 100,000 for maternity patients who accept blood tranfusions.
http://www.biomedcentral.com/content/pdf/1471-2393-2-7.pdf
Cog