I... thought I did summarize it nicely:

But we know they correlate with IQ, and quite a few respondents included ACT/SAT1600/SAT2400 data while they didn't include the IQ; so all we have to do is take for each standardized test the subset of people with IQ scores and people without, and see if the latter have lower scores indicating lower IQs. The results seem to indicate that while there may be a small difference in means between the groups on the 3 scores, it's neither of large effect size nor statistical significance.