Would be interesting to see a SEM analysis of this looking at the impact on a latent IQ measure behind these test results that each try to get at it separately. This model should have much better power to find an effect and not suffer from multiple hypothesis testing issues looking at the different tests separately. Model would be of the form
Latent variable definition
IQ =~ RAPM+BDS+Other tests
Regression
IQ ~ Creatine+Other explanatory variables(Age,vegetarian etc.)
Would be interesting to see a SEM analysis of this looking at the impact on a latent IQ measure behind these test results that each try to get at it separately. This model should have much better power to find an effect and not suffer from multiple hypothesis testing issues looking at the different tests separately. Model would be of the form
Latent variable definition
IQ =~ RAPM+BDS+Other tests
Regression
IQ ~ Creatine+Other explanatory variables(Age,vegetarian etc.)