While looking up information on MBTI in psych article databases, I ran across this study:
Application of Psychological Type in Posttraumatic Stress Disorder Treatment.
Author(s): Otis, Gerald D., Department of Veterans Affairs, US
This little tidbit was in the summary at
http://web.ebscohost.com/ehost/detail?vid=16&hid=111&sid=310b0e96-6f84-476b-a48f-4173a79214d5%40sessionmgr104
More than 70% of the participants in the nine groups studied fell into just three psychological types: ISTP, INTP, and ISTJ.
This struck me as interesting, both because of personal interest and because of the very obvious over-representation. So I looked for other, similar studies, and EBSCO turned up this:
MBTI profiles of Vietnam veterans with post-traumatic stress disorder.
Author(s): Dalton, John E., Veterans Affairs Medical Ctr, North Chicago, IL, US Aubuchon, Ivan Tom, Agnes Pederson, Sanford L. et al.
From the summary:
MBTI types ISTP, ISTJ, and INTP accounted for over 64% of the PTSD sample.
Unfortunately, that was the only other study on it in their database, but it raises an interesting question: why would these 3 be so over-represented in the two studies?