The development of 1.5 during those years is huge. The difference between interacting with a 16 and 18 year old are night and day in experience and maturity. Bu

The development of 1.5 during those years is huge. The difference between interacting with a 16 and 18 year old are night and day in experience and maturity. But I agree with you this would be incredibly difficult to accurately measure differences with a lack of accelerated students and subjective questions/answers.