All studies were assessed as having high‐risk of bias which, in part, reflects challenges conducting terrorism research.ġ.4.
For Objective 3 (Risk Factor), it was not appropriate to calculate a pooled effect size due the differences in comparison samples. When isolating studies reporting data for any mental health difficulty that emerged before either engagement in terrorism or detection for terrorist offences (Objective 2: Temporality), the life‐time prevalence rate was 27.8% (95% CI = 20.9%–35.9%). When collapsing all studies reporting psychological problems, disorder, and suspected disorder into one meta‐analyses ( k = 37), the pooled prevalence rate was 25.5% (95% CI = 20.2%–31.6%). For Objective 1, the life‐time prevalence rate of diagnosed mental disorder in terrorist samples ( k = 18) was 17.4%. Of the 73 studies, 10 were eligible for Objective 2 (Temporality) and nine were eligible for Objective 3 (Risk Factor).
Fifty‐six papers reporting on 73 different terrorist samples (i.e., studies) ( n = 13,648) were identified.
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