Correlation
Studies of developing adolescents and young adults indicate a very small positive correlation between human IQ and height within national populations. The association is supported by studies linking height at eighteen with subsequent scholarly performance.
Correlation coefficients in developing children are typically about 0.2. A large study conducted on Norwegian soldiers the correlation between height and general ability was .15. The effect appears to hold into the extremes of stature, but may decrease with age.
The correlation between the two factors is therefore weak, although statistically significant. Consequently, these studies do not imply that there are no short people who are highly intelligent or that variations in stature have a direct effect on cognitive ability. However, similar strength correlations have been found in early and late childhood in both developed and developing countries, even after controlling for social class and parental education. In adults, changes in environment and social status reduce the strength of this correlation.
A recent study by Anne Case and Christina Paxson has attracted media attention.
Read more about this topic: Height And Intelligence