. Author manuscript; available in PMC: 2018 Mar 1.

Published in final edited form as: J Consult Clin Psychol. 2017 Mar;85(3):274–281. doi: 10.1037/ccp0000180

Table 3. Results from Unconditional and Conditional Models with SUDS and Craving Habituation as Predictors of Change in PTSD Symptoms Across Treatment.

Unconditional Model	B	SE	t	Average W-S SUDS	B	SE	t
Intercept	61.95	1.59	39.02^***	Intercept	62.26	1.74	35.89^***
Session	-2.88	0.58	-4.96^***	Session	-2.93	0.61	-4.81^***
Session²	0.10	0.04	2.34^*	Session²	0.10	0.04	2.40^*
				W-S SUDS	0.08	0.14	0.60
				W-S SUDS*Session	0.01	0.03	0.32

*B-S SUDS*	B	SE	t	*Early W-S SUDS*	B	SE	t

Intercept	61.66	2.03	30.32^***	Intercept	61.60	2.02	30.52^***
Session	-3.34	0.62	-5.37^***	Session	-3.30	0.64	-5.14^***
Session²	0.11	0.04	2.47^*	Session²	0.11	0.04	2.45^*
B-S SUDS	-0.02	0.09	-0.18	W-S SUDS	0.04	0.07	0.59
B-S SUDS*Session	0.03	0.01	2.03^*	W-S SUDS*Session	-0.01	0.01	-0.49
				W-S SUDS*Session²	-2.26	15.10	-0.15

*B-S Craving*	B	SE	t	*Late W-S SUDS*	B	SE	t

Intercept	61.37	1.95	31.46^***	Intercept	61.62	2.06	29.94^***
Session	-3.27	0.39	-8.35^***	Session	-3.31	0.64	-5.15^***
Session²	0.10	0.02	4.22^***	Session²	0.11	0.04	2.46^*
B-S Craving	-0.09	0.07	-1.32	W-S SUDS	-0.09	0.11	-0.81
B-S Craving*Session	0.02	0.01	2.36^*	W-S SUDS*Session	-0.01	0.02	-0.35

Note: B-S = between-session, PTSD = posttraumatic stress disorder, SUDS = Subjective Units of Distress Scale, W-S = within-session.

p < .05,

^**

p < .01,

^***

p < .001.

The interaction between Session² and the level two predictor only improved model fit for the model with Early W-S SUDS. Reduced models without this fixed effect were retained for all other models.