Not the specific info for any study, but here is the language from
www.Cogat.com - under the "Ability Profile System" link and then in my DD's case we looked up the 9E(Q-) profile. This language is included under the second paragraph:
"When students obtain an E profile, it is important to double-check the integrity of their scores. The section "For Additional Information" (below) directs teachers to parts of the CogAT Interpretive Guide for Teachers and Counselors that explain how to check (1) whether the students attempted most of the test items, (2) whether their score reports contain score warnings, and (3) whether the confidence intervals on their plot of scores (shown on the List of Student Scores and the Profile Narrative Report) are reasonable. "
I just checked under a 9E(V-) and the language is similar. Hope this helps some of you!