Quote:
Originally Posted by cuervo72
I would think that at some point, the survival rate rockets up then levels off.
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There are big drops around Week 3, Week 6, and Week 12. A detected heartbeat (usually in the Week 7-9 range) and making it out of the first trimester are significant milestones. Most physicians agree that the vast majority of miscarriages are the result of severe chromosome-related defects, and the vast majority of them cause death prior to the end of the first trimester. Once the first trimester is complete, there's only roughly a 3% chance of miscarriage. After that point, there's a significantly increased frequency of them being caused by other factors (illness/disease in mother, accidents, mother's lifestyle choices, etc.)
In response to your specific comment about it leveling off: the rate of survival is pretty level and quite high once you hit the second trimester. And the dropoff between detection of the heartbeat roughly midway through the first trimester and the end of the first trimester isn't all *that* big, I'm fairly sure.