Most of the remainder are at level 2 ~(primary school 6-12/15YO / gangster / psychopath) or level 1 ~(toddler 2-6YO, borderline personality disorder). Note that the characterizations of these two levels are impressionistic / comic book to give you an idea.

A gentle summary and links here https://drive.google.com/file/d/0B_hpownP1A4PdERFVXJDVE5SRnc/view?usp=sharing

I personally find this framework very powerful for understanding other people, understanding myself and my development challenges and for dealing with other people.

I am forced to spend a fair bit of time in a socially deprived part of the city and I find a lot of L2 people there.