. 2013 Oct 18;40(6):1482–1490. doi: 10.1093/schbul/sbt145

Table 4.

PI for Risk Classification

Risk Class of PI	Prognostic Score^a	Number of Subjects^b	Transition (%)	Estimated Time to Transition (Months)
Risk Class of PI	Prognostic Score^a	Number of Subjects^b	Transition (%)	Mean (SE)	95% CI
I	<−1.51	27	1 (3.7)	35.46 (0.53)	34.42–36.50
II	−1.51/−0.39	12	3 (25)	31.86 (2.39)	27.18–36.54
III	>−0.39	19	14 (73.7)	18.04 (12.09)	12.09–24.00

Note: PI, prognostic index.

^aThe individual prognostic scores are calculated as {0.757 × social-personal adjustment score} + {−0.231 × P300 amplitude}.

^bOf the 58 subjects that were included in the final Cox model.