1. The mean performance IQ score is estimated to increase by 2.06 point for each one unit increase in brain size, controlling for height and weight.
  2. The mean performance IQ score is estimated to decrease by 2.73 points for each one inch increase in height, controlling for brain size and weight.
  3. The mean performance IQ score is estimated to increase by 0.000716 points for each one pound increase in weight, controlling for brain size and height.
  4. 29.49% of the variation in perfomance IQ scores is explained by brain size, height and weight. This is fairly low, so these variables alone do not provide much predictive power for performance IQ scores.