Table 3.
Therapy Completer Sample: A Comparison of Explained Variances (R2) for Mean PTSD Symptom Cluster and Total Scores With a Linear Versus Quadratic Fit for Prolonged Exposure (PE) and Cognitive-Processing Therapy (CPT)
| Treatment | R2 (%) | df | F | Sig F | b0 (Sig t) | b1 (Sig t) | b2 (Sig t) |
|---|---|---|---|---|---|---|---|
| PE: Reexperiencing | |||||||
| Linear | 49 | 3 | 2.94 | .18 | 8.16 (0.01) | −0.73 (0.18) | |
| Quadratic | 94 | 2 | 17.12 | .05 | 4.04 (0.07) | 2.80 (0.09) | −0.59 (0.06) |
| CPT: Reexperiencing | |||||||
| Linear | 63 | 3 | 5.14 | .11 | 8.35 (0.01) | −0.88 (0.11) | |
| Quadratic | 96 | 2 | 21.77 | .04 | 4.61 (0.05) | 2.32 (0.11) | −0.53 (0.06) |
| PE: Avoidance | |||||||
| Linear | 88 | 3 | 23.11 | .02 | 15.83 (0.01) | −1.78 (0.02) | |
| Quadratic | 98 | 2 | 66.79 | .01 | 12.28 (0.01) | 1.26 (0.27) | −0.51 (0.07) |
| CPT: Avoidance | |||||||
| Linear | 94 | 3 | 51.56 | .01 | 14.93 (0.01) | −1.74 (0.01) | |
| Quadratic | 98 | 2 | 54.01 | .02 | 12.89 (0.01) | 0.00 (1.00) | −0.29 (0.18) |
| PE: Arousal | |||||||
| Linear | 83 | 3 | 14.67 | .03 | 12.08 (0.01) | −1.18 (0.03) | |
| Quadratic | 99 | 2 | 69.80 | .01 | 9.04 (0.01) | 1.42 (0.13) | −0.43 (0.04) |
| CPT: Arousal | |||||||
| Linear | 87 | 3 | 20.19 | .02 | 11.97 (0.01) | −1.22 (0.02) | |
| Quadratic | 100 | 2 | 325.04 | .01 | 9.23 (0.01) | 1.13 (0.05) | −0.39 (0.01) |
| PE: Total PSS | |||||||
| Linear | 79 | 3 | 11.46 | .04 | 36.05 (0.01) | −3.69 (0.04) | |
| Quadratic | 98 | 2 | 52.18 | .02 | 25.38 (0.01) | 5.45 (0.12) | −1.52 (0.05) |
| CPT: Total PSS | |||||||
| Linear | 87 | 3 | 20.25 | . 02 | 35.22 (0.01) | −3.85 (0.02) | |
| Quadratic | 98 | 2 | 68.16 | .01 | 26.95 (0.01) | 3.23 (0.22) | −1.18 (0.06) |
Note. PTSD = posttraumatic stress disorder; Sig = significant; PSS = PTSD Symptom Scale.