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. Author manuscript; available in PMC: 2007 Oct 16.
Published in final edited form as: Biol Psychiatry. 2007 Feb 16;62(6):607–615. doi: 10.1016/j.biopsych.2006.10.029

Table 6.

Factors Affecting Estimated IQ in Alcoholic Patients

r2 ICV Education Age Family History Age of Onset Family History x Age of Onset
complete model F p F p F p F p F p F p
Total Estimated IQ 0.27 4.389 0.038 22.587 < 0.0001 2.087 0.151 7.62 0.007 0.163 0.163 4.85 0.029
Vocabulary IQ 0.35 4.025 0.042 27.158 < 0.0001 4.271 0.041 5.857 0.017 0.070 0.792 1.596 0.208
Block IQ 0.19 0.398 0.529 6.344 0.013 14.839 0.0002 3.993 0.049 0.854 0.357 5.646 0.019

The value of r2 equals the amount of variance explained by all of the factors (ICV, education, age, family history, and age of onset) included in the model.