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Well, I'm not expert but 80% of 5% is another 4% so it seems that without Clomid your chances of having twins is 5% and with Clomid it's more like 9%. So the odds of having a single baby on Clomid is still 90%, down from 95%.
Fawn, since you've done lots of research, can you explain the other genetic factors that increase the odds of twins? I know they're higher if you have Negro ancestry, then Caucasian and Asian/Polynesian/Native American have the lowest percentage. I remember that from genetics. And I know they occur more in women who are tall and overweight. And that mom having a grandmother with fraternal twins on either side ups your odds too, as does having already had a fraternal twin pregnancy. And that if you're between 35-45 you're at your peak 'twin' time.
Me, I've had a 'vanishing twin' pregnancy, my gran had 2 sets of fraternals, I'm tall, Caucasian, need to lose 30 pounds, 38 and am in my first cycle of Clomid so goodness knows where my odds are now...somewhere over 10% I venture ;o)

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