More research needs to be done
The authors noted the need for more research into the differences found in parent perceptions and student ages. They remarked about possible qualitative differences in teachers at the earlier years and those of older students. They also speculated about the effects of the amount of time a parent has spent trying to gain assistance for their child and their perceptions.
On a personal note, I believe that there is another area to be investigated for these differences. The main emphasis of educators of small children is on development of skills in all areas: socially, mentally, communication/verbally, and academically. As students move into middle and high school, the emphasis is on technical and data driven results for their subject area, and no longer on the child as a whole person. In elementary schools, science /social studies were hands on, active, and included social skills, not standards driven. Kids with disabilities were able to be mainstreamed with less noticeable differences. Once teachers specialize into different areas, there are no more "social" based classes.