I would say that the particular importance of the measurement is far less relevant than the repeatability of the measurement. In that regard, because IQ is very

I would say that the particular importance of the measurement is far less relevant than the repeatability of the measurement. In that regard, because IQ is very repeatable in the mid-range, population effects measured by IQ should be considered as evidence of some effect on the neurological system. Even if IQ is meaningless, this result is still evidence of neurological harm.