The heights of 2,848 students, ages 5–13, were recorded and it was found that at every grade level, the oldest students in the class were the shortest (Wake, Coghlan, &

Hesketh, 2000). The conclusion was that these students were being held back because of faulty teacher perceptions. That is, the teachers perceived the lack of height as a sign of immaturity and a lack of readiness for promotion. This was found to be especially true for boys. What other reasons might you suggest to explain this result?