Patterns of change in physical functioning and posttraumatic stress disorder with cognitive processing therapy in a randomized controlled implementation trial

Figures & data

Table 1. Descriptive statistics for number of days since baseline, PCL-IV, and SF-12 PCS.

	Days Since Baseline		PCL-IV			SF-12 PCS
Session	M	SD	n	M	SD	n	M	SD
0	.00	.00	149	61.15	11.07	140	41.79	11.33
1	13.66	15.94	164	59.63	11.84	30	41.29	12.36
2	22.68	17.75	168	57.58	13.21	137	42.22	11.28
3	35.31	37.30	154	57.24	12.62	18	42.22	10.53
4	45.92	42.72	141	56.94	13.84	119	42.20	11.72
5	54.78	42.87	127	55.56	14.76	22	39.34	13.02
6	64.56	45.48	127	53.17	15.67	103	41.72	11.13
7	77.13	49.71	121	50.94	14.74	21	41.43	11.32
8	86.50	51.05	120	50.15	15.92	104	41.70	11.96
9	95.97	53.16	116	48.97	16.31	25	38.03	11.74
10	109.7	59.58	113	47.59	15.44	91	41.54	12.36
11	118.2	61.19	108	47.28	15.72	26	38.54	12.72
12	122.5	48.32	108	44.31	16.26	87	41.85	12.07

Overall sample size was N = 188; some assessments were missing for individual clients at each timepoint. Clinicians collected SF-12 from their clients every other session starting from their client’s first assessment. PCL-IV = Posttraumatic Stress Disorder Checklist, SF-12 PCS = Short Form Health Survey Physical Component Summary, M = mean, SD = standard deviation.

Table 2. Fixed effect estimates of the multilevel physical functioning change score analysis.

Parameter	b	SE	p	pr
Change in SF-12 PCS from baseline
Time (linear)	.00	.01	.91	−.01
Baseline SF-12 PCS	.07	.01	<.001	.21
Time (linear) $\times$ Baseline SF-12 PCS	−.002	.00	<.001	−.24

SF-12 PCS = Short Form Health Survey Physical Component Summary, b = unstandardized coefficient, SE = standard error, p = p-value, pr = partial regression coefficient (small =.10, medium =.24, large =.37).

Figure 1. Predicted trajectory of clients’ physical functioning over the course of CPT. Clients who entered the treatment with low levels of physical functioning reported a significant improvement in their perceived physical functioning. SF-12 PCS = Short Form Physical Health Survey Physical Component Summary, SD = standard deviation, CPT = cognitive processing therapy.

Table 3. Fixed effect estimates of the multilevel moderator analysis on the interaction between clients’ baseline physical health and PTSD symptom trajectory.

Parameter	b	SE	p	pr
PCL-IV from every session
Intercept	74.00	4.00	<.001	.82
Time (linear)	−.09	−.04	.02	−.07
Time (quadratic)	.00	.00	.24	.03
Baseline SF-12 PCS	−.29	.10	.002	−.23
Time (linear) $\times$ Baseline SF-12 PCS	−.002	.00	.02	−.06
Time (quadratic) $\times$ Baseline SF-12 PCS	.00	.00	.25	.03

PTSD = posttraumatic stress disorder, b = unstandardized coefficient, SE = standard error, p = p-value, pr = partial regression coefficient (small = .10, medium = .24, large = .37), PCL-IV = Posttraumatic Stress Disorder Checklist, SF-12 PCS = Short Form Health Survey Physical Component Summary.

Table 4. Fixed-effect estimates for the hypothesized and exploratory multilevel lagged analyses.

Parameter	b	SE	p	pr
PTSD Symptoms
Intercept	1.15	2.04	<.001	.39
Auto-Correlated PCL-IV	.84	.02	<.001	.95
Cross-Lagged SF-12 PCS	−.10	.03	<.001	−.28
Time (Linear)	−.01	.01	.39	−.03
Time (Quadratic)	.00	.00	.75	−.01
Physical Functioning
Intercept	9.93	3.70	.008	.23
Auto-Correlated SF-12 PCS	.83	.05	<.001	.83
Cross-Lagged PCL-IV	−.04	.04	.31	−.09
Time (Linear)	−.01	.01	.44	−.07

b = unstandardized coefficient, SE = standard error, p = p-value, pr = partial regression coefficient (small = .10, medium = .24, large = .37), PTSD = posttraumatic stress disorder, PCL-IV = Posttraumatic Stress Disorder Checklist, SF-12 PCS = Short Form Physical Health Survey Physical Component Summary.