Table 1.

Means, Standard Deviations, Frequencies, and Percentages of Outcome and Mediator Variables

	PCL-M				TLFB (any use)				TLFB (% days using, conditional on use)
	COPE		RP		COPE		RP		COPE		RP
Session	M	SD	M	SD	n	%	n	%	M	SD	M	SD
Baseline	62.17	11.03	64.26	8.93	48	88.9	25	92.6	52.85	33.72	54.06	32.23
Session 1	58.59	11.43	58.21	11.49	33	61.1	17	63.0	55.78	34.04	61.85	30.21
Session 2	57.86	13.38	57.64	11.16	31	67.4	16	59.3	54.23	33.50	53.42	27.32
Session 3	53.89	12.66	55.19	14.86	27	50.0	12	44.4	52.72	31.90	55.19	28.60
Session 4	53.07	14.58	55.16	14.78	28	51.9	12	44.4	52.03	27.06	50.74	35.94
Session 5	50.41	15.64	56.31	14.62	23	42.6	10	37.0	50.99	32.12	52.10	31.74
Session 6	45.54	15.59	58.00	18.47	25	46.3	10	37.0	33.64	26.15	43.32	26.07
Session 7	44.21	18.00	56.93	13.96	22	40.7	9	33.3	38.03	24.34	29.42	11.93
Session 8	42.25	16.84	52.53	13.91	19	35.2	5	18.5	42.07	31.69	35.93	14.51
Session 9	41.37	17.40	49.43	12.27	17	31.5	5	18.5	45.40	23.92	47.54	13.00
Session 10	39.90	18.23	49.14	15.09	15	27.8	9	33.3	39.91	20.80	47.12	26.40
Session 11	39.93	17.72	54.00	13.24	13	24.1	6	22.2	31.68	21.22	58.89	25.60
Session 12	36.57	17.20	53.07	14.49	14	25.9	9	33.3	43.33	26.66	42.27	36.23

Note. The percentage of each group reporting any substance use at each session is based on the number of participants in the intent-to-treat sample (n =54 in COPE; n = 27 in RP).PTSD = posttraumatic stress disorder; COPE = Concurrent Treatment of PTSD and Substance Use Disorders Using Prolonged Exposure; PCL-M = PTSD Checklist–Military Version; RP = relapse prevention; TLFB = timeline follow-back.