At this stage of such research, behavior problems can be quantified and measured very reliably.
Check-lists are reliable.
Video-taping and filling in check-lists afterwards is reliable.
The allegation while technically correct has no significant bearing on the facts of the study. Behavioral problems can be measured and quantified very reliably, repeatably, congruently, validly.
Fabulous.
A statistician with a preconceived notion to "prove".