. Author manuscript; available in PMC: 2013 Sep 1.

Published in final edited form as: Psychol Assess. 2012 Jan 16;24(3):685–700. doi: 10.1037/a0026668

Table 9.

Logistic Regression Analyses Testing the Incremental Validity of START Assessments over PCL:SV Total Scores

	Any Aggression			Verbal Aggression			Physical – Objects			Physical – Others
Step 1	Model fit χ²(1) = 21.72^***			Model fit χ²(1) = 19.13^***			Model fit χ²(1) = 3.69			Model fit χ²(1) = 15.67^***

	β	Wald	Odds Ratio	β	Wald	Odds Ratio	β	Wald	Odds Ratio	β	Wald	Odds Ratio

PCL:SV Total Score	0.24^***	16.42	1.27	0.22^*	14.94	1.25	0.12	3.50	1.13	0.23^***	12.55	1.26

Step 2	Model fit χ²(3) = 36.74^* Δχ²(2) = 15.02^*			Model fit χ²(3) = 34.62^* Δχ²(2) = 15.41^*			Model fit χ²(3) = 18.44^* Δχ²(2) = 14.75^*			Model fit χ²(3) = 29.14^* Δχ²(2) = 13.48^*

	β	Wald	Odds Ratio	β	Wald	Odds Ratio	β	Wald	Odds Ratio	β	Wald	Odds Ratio

PCL:SV Total Score	0.13	3.71	1.14	0.11	2.79	1.11	0.03	0.10	0.97	0.15^*	3.94	1.16
Strength Total Score	0.01	0.07	1.01	0.00	0.00	1.00	0.05	0.45	1.05	0.14^*	4.33	1.15
Vulnerability Total Score	0.11^*	3.91	1.12	0.12^*	4.70	1.13	0.12	3.06	1.13	0.00	0.00	1.00

Step 3	Model fit χ²(4) = 44.40^* Δχ²(1) = 7.65^			Model fit χ²(4) = 50.52^*** Δχ²(1) = 5.90^*			Model fit χ²(4) = 31.68^* Δχ²(1) = 13.23^*			Model fit χ²(4) = 21.72^* Δχ²(1) = 14.83^*

	β	Wald	Odds Ratio	β	Wald	Odds Ratio	β	Wald	Odds Ratio	β	Wald	Odds Ratio

PCL:SV Total Score	0.07	0.89	1.07	0.06	0.60	1.06	0.15	2.24	0.86	0.04	0.22	1.04
Strength Total Score	0.02	0.15	1.02	0.01	0.02	1.01	0.03	0.14	1.03	0.14	3.62	1.15
Vulnerability Total Score	0.05	0.71	1.05	0.07	1.38	1.07	0.05	0.42	1.05	0.08	1.23	0.93
Violence Risk Estimate	1.06^**	7.06	2.89	0.91^*	5.57	2.49	2.08^**	9.77	7.98	1.85^***	11.53	6.38

Note.Strength total scores are reverse coded such that lower scores indicate greater strength.

p < .05.

^**

p < .01.

^***

p < .001.