Okay, thanks for the clarification ColinsMum.
Of course, I forgot to mention what you are saying, gratefulmom, that obviously this didn't have much of an effect on our kids.
How can you tell what effect it had or didn't have? I think that all you can say is that your kids are doing well (which is plenty). I'm skeptical, just because being born prematurely certainly isn't optimal, and if it has any possible effect at all, which has been demonstrated, I don't see a reason to assume that being somewhat premature has zero effect. You can probably take a bit of an edge off someone with vast potential and still leave vast potential.
Similarly, malnutrition is known to inhibit brain development-- and I see no reason to assume that that effect wouldn't be suffered by everyone, do you?-- yet I'm sure there are quite a few brilliant people who were at least somewhat malnourished at some point in their development. Wouldn't they have been better off under optimal conditions?
