Table 4.
Impact of Web-based interventions on PTSD: subgroup analyses.
| Analysis | Subgroups | Comparisons, n | Participants, n | SMDa (95% CI) | P | I2 statistic, % | |
| Primary analysis | 38 | 3832 | -0.35 (-0.45 to -0.25) | <.001 | 81 | ||
| Comparison group | |||||||
| Active | 18 | 1533 | -0.27 (-0.43 to -0.11) | <.001 | 52 | ||
| Waitlist or TAU | 20 | 2352 | -0.41 (-0.69 to -0.14) | <.001 | 89 | ||
| Model of therapy | |||||||
| TF-CBT | 11 | 997 | -0.34 (-0.48 to -0.21) | <.001 | 92 | ||
| Interapy | 3 | 465 | -10.24 (-12.32 to -8.15) | <.001 | 0 | ||
| Other | 8 | 532 | -0.30 (-0.44 to -0.16) | <.001 | 77 | ||
| Non-TF-CBT | 18 | 2227 | -0.36 (-0.50 to -0.22) | <.001 | 62 | ||
| Expressive writing | 5 | 346 | -0.04 (-0.88 to 0.79) | .92 | 0 | ||
| Attention bias modification | 1 | 102 | — | — | — | ||
| Working memory capacity task | 1 | 42 | — | — | — | ||
| Semistructured peer support | 1 | 72 | — | — | — | ||
| Mindfulness-based stress reduction | 1 | 62 | — | — | — | ||
| Guidance | |||||||
| Individual tailored feedback | 16 | 1743 | -0.52 (-0.76 to -0.28) | <.001 | 90 | ||
| Individual technical support | 2 | 261 | -0.27 (-0.40 to -0.14) | <.001 | 0 | ||
| Online discussion forum | 6 | 913 | -0.26 (-0.53 to 0.01) | .06 | 72 | ||
| Automated feedback only | 1 | 27 | — | — | — | ||
| Live group feedback | 1 | 62 | — | — | — | ||
| No guidance | 13 | 927 | -0.50 (-0.76 to -0.24) | <.001 | 13 | ||
aSMD > 0 favors control, and SMD < 0 favors active intervention.