Outcomes | Number of studies, Number of participants(n) and a summary risk of bias | Findings and heterogeneity | Strength of evidence |

PTSD | 8 studies; n=1484 Three low risks of bias studies | Pooled SMD=−0.66; 95% CI (−0.87 to −0.44); Q=22.0935; df=8; p=0.0047; I^{2}=63.8%; tau-squared=0.0627 | Limited |

Depression | 7 studies; n=1162 Three low risks of bias studies | Pooled SMD=−0.69; 95% CI (−0.98 to −0.39); Q=31.585; df=7; p=04.85E-5; I^{2}=77.84%; tau-squared=0.1247 | Limited |

Functional impairment | 6 studies; n=1337 Two low risks of bias studies | Pooled SMD=−0.57; 95% CI (−0.83 to−0.31); Q=22.322; df=6; p=0.001; I^{2}=73.12%; tau-squared=0.0842 | Limited |

Anxiety | 4 studies; n=1044 Two low risks of bias studies | Pooled SMD=−0.71; 95% CI (−0.96 to−0.45); Q=14.51; df=4; p=0.0058, I^{2}=72.44%; tau-squared=0.0582 | Limited |

Grief | 2 studies; n=147 One low risk of bias study | Pooled SMD=−0.23; 95% CI (−0.63 to 0.16); Q=0.227; df=1; p=0.634; I^{2}=0%; tau-squared=0 | Limited |

Negative sign of pooled SMD indicates a positive effect of CBT.

CBT, cognitive–behavioural therapy; n, number of participants; PTSD, post-traumatic stress disorder; SMD, standardised mean difference.