Table 5

Standardised parameter estimates from latent growth curve models individually testing the effects of each treatment engagement factor on changes in PCL-S scores over time

Treatment engagement factorsGrowth factors for PCL-S scoresModel fit CFI/SRMR
Direct effects of intercept on treatment engagement factorsDirect effects of treatment engagement factors on linear slopeDirect effects of treatment engagement factors on quadratic term
Number of weeks in studyβ=−0.07β=0.11β=−0.051.00/0.08
Number of CPT sessions with repeated contentβ=0.12β=−0.07β=0.0011.00/0.08
Dose of CPTβ=−0.13β=0.16β=−0.081.00/0.08
Frequency of sessionsβ=0.02β=0.05β=0.030.99/0.09
Consistency of sessionsβ=0.06β=0.11β=0.010.98/0.09
  • Frequency of sessions was measured as the mean number of days between sessions. Consistency of sessions was measured as the SD of the number of days between sessions.

  • β, standardised parameter estimates; CFI, comparative fit index; CPT, cognitive processing therapy; PCL-S, Post-Traumatic Stress Disorder Checklist-Specific version; SRMR, standardised root mean residual.