Table 4.

Estimated variance components for random effects for CPT and PE.

Modification type		Estimate	SE	LRT p-value	Proportion of variance
Tailoring/Tweaking
Therapist effects		0.123	0.186	0.241	0.025
Patient effects		1.506	0.288	< 0.0001	0.306
Switching CPT type
Therapist effects		0.247	0.400	0.259	0.052
Patient effects		1.194	0.470	0.002	0.252
Integrating another treatment
Therapist effects		0.429	0.393	0.116	0.090
Patient effects		1.028	0.543	0.017	0.217
Session lengthening/extending
Therapist effects		1.612	0.314	< 0.0001	0.261
Patient effects		1.276	0.187	< 0.0001	0.207
Protocol lengthening/extending
Therapist effects		1.287	0.445	< 0.0001	0.281
Patient effects		NA (Scored at patient level across all sessions)
Session shortening/condensing
Therapist effects		0.498	0.102	< 0.0001	0.084
Patient effects		2.116	0.133	< 0.0001	0.358
Repeating
Therapist effects		0.671	0.122	< 0.0001	0.169
Patient effects		0.017	0.058	0.380	0.004
Reordering
NA (very rare event)
Spreading
Therapist effects		0.479	0.115	< 0.0001	0.116
Patient effects		0.367	0.097	< 0.0001	0.089
Drift
Therapist effects		0.433	0.159	0.0002	0.098
Patient effects		0.698	0.218	< 0.0001	0.159
Removing
Therapist effects		0.580	0.088	< 0.0001	0.148
Patient effects		0.040	0.039	0.133	0.010

^aAll modifications except protocol extending were based on EBP sessions 1 through 7.

CPT, Cognitive Processing Therapy; PE, Prolonged Exposure.