Table 2. ASI composite scores and the PSS at baseline and week 12 and 26, M (SD).

				Statistical analysis GEE
Dimension	Time*	CBT Group	Control Group	Main effects of group: p value	Main effects of time: p value	Interaction of group and time: p value	Goodness of Fit (Model): QIC* value
Physical	Baseline	0.14 (0.28)	0.11 (0.22)
Health	Week 12	0.07 (0.22)	0.13 (0.34)
	Week 26	0.05 (0.14)	0.05 (0.17)	0.739	0.001	0.202	46.712
Employment	Baseline	0.59 (0.24)	0.56 (0.27)
	Week 12	0.49 (0.27)	0.54 (0.25)
	Week 26	0.45 (0.27)	0.55 (0.24)	0.104	0.022	0.032	52.106
Alcohol Use	Baseline	0.05 (0.12)	0.05 (0.10)
	Week 12	0.04 (0.08)	0.03 (0.05)
	Week 26	0.02 (0.05)	0.03 (0.06)	0.932	0.001	0.072	15.706
Opiate use	Baseline	0.18 (0.07)	0.18 (0.07)
	Week 12	0.04 (0.05)	0.05 (0.05)
	Week 26	0.04 (0.06)	0.05 (0.06)	0.401	0.001	0.549	14.065
Illegal	Baseline	0.09 (0.17)	0.11(0.19)
Problems	Week 12	0.02 (0.05)	0.01 (0.04)
	Week 26	0.01 (0.02)	0.01 (0.04)	0.632	0.001	0.556	18.554
Family	Baseline	0.33 (0.39)	0.41 (0.45)
Support	Week 12	0.28 (0.30)	0.27 (0.31)
	Week 26	0.30 (0.34)	0.25 (0.28)	0.778	0.001	0.111	88.665
Mental Health	Baseline	0.13 (0.20)	0.12 (0.19)
	Week 12	0.04 (0.08)	0.04 (0.11)
	Week 26	0.05 (0.12)	0.04 (0.11)	0.880	0.001	0.843	23.910
Psychological Stress	Baseline	19.67 (4.23)	18.46 (4.59)
	Week 12	16.30 (5.02)	17.04 (5.28)
	Week 26	15.51 (5.02)	17.13 (5.12)	0.402	0.001	0.008	14257.767

CBT, cognitive behavioral group; M, mean; SD, standard deviation. All data were presented as M(SD).

* The sample size was 97 for CBT group and 98 for control group at week 12, 92 for CBT group and 82 for control group at week 26.