> (poor starting egg quality, genetic and cellular damage from ice crystals, mitochondrial damage potential, implantation problems, etc)
Well, IVF doesn't necessarily imply any of those things -- in male infertility the eggs may be of high quality, in a fresh cycle the embryos may not be frozen at all, in a healthy mother there may be no implantation issues, etc. There are perhaps hundreds of factors to control for, and the null hypothesis would change depending on the population of IVF children (and their parental history) you're studying.
Well, IVF doesn't necessarily imply any of those things -- in male infertility the eggs may be of high quality, in a fresh cycle the embryos may not be frozen at all, in a healthy mother there may be no implantation issues, etc. There are perhaps hundreds of factors to control for, and the null hypothesis would change depending on the population of IVF children (and their parental history) you're studying.