Predicting the outcome of a cognitive-behavioral group training for patients with unexplained physical symptoms: a one-year follow-up study

Table 4 Hierarchical multiple regression models for predicting CBT outcome

	Immediate CBT outcome^a				Short-term CBT outcome^b				Long-term CBT outcome^c
	b	Standard error	β^I	R²	b	Standard error	β^I	R²	b	Standard error	β^I	R²
*Step 1*
Constant	13.10	4.10			9.09	3.72			14.88	4.38
Control variables
Physical Component Summary (SF-36: PCS)	−0.27	0.08	-.34^**		−0.19	0.08	-.26^*		−0.22	0.08	-.27^*
Age	−0.05	0.07	-.07		0.03	0.07	.04		−0.11	0.08	-.16
Gender	2.33	2.02	.12		1.09	1.79	.06		2.66	2.11	.13
Marital status	1.60	1.65	.10		−0.49	1.51	-.03		1.39	1.66	.09
Employment	−0.36	1.69	-.02		−0.16	1.51	-.01		1.26	1.73	.08
Explained variance by control variables (R²)				.11				.07				.10
*Step 2*
Constant	−10.06	10.22			−12.36	8.24			0.87	10.57
Control variables
Physical Component Summary (SF-36: PCS)	−0.16	0.09	-.20		−0.10	0.08	-.13		−0.15	0.09	-.19
Age	−0.01	0.07	-.02		0.04	0.06	.06		−0.10	0.08	-.14
Gender	1.05	2.20	.05		0.92	1.89	.05		1.51	2.32	.07
Marital status	1.85	1.65	.11		−0.42	1.42	-.03		1.25	1.66	.08
Employment	−0.53	1.68	-.03		−0.71	1.43	-.05		1.06	1.73	.06
Predictors
Global severity index (SCL-90)	0.06	0.03	.36^*		0.06	0.02	.41^**		0.06	0.03	.33^*
Personality-disorder characteristics (VKP)	−0.08	0.09	-.11		−0.19	0.07	-.32^*		−0.18	0.09	-.28^*
Psychiatric history (SCID)	0.72	1.50	.05		2.79	1.27	.20^*		1.12	1.52	.07
Mental Component Summary (SF-36: MCS)	0.20	0.09	.30^*		0.21	0.07	.36^**		0.10	0.09	.15
Explained variance by predictors ( ΔR²)				.06				.15^**				.06

^a Immediate CBT outcome was computed by subtracting the baseline PCS-score from the post-training PCS-score.
^b Short-term CBT outcome was computed by subtracting the baseline PCS-score from the three-months follow-up PCS-score.
^c Long-term CBT outcome was computed by subtracting the baseline PCS-score from the one-year follow-up PCS-score.
^I β is the standardized value of b.
^*p≦.05, ^**p≦.01, ^***p≦.001.

ISSN: 1471-2458