What question did this study set out to answer?

To assess if the Global Psychotrauma Screen total score is a valid indicator of trauma-related symptoms in an Italian community sample.

Evaluating the global psychotrauma screen total score using item response theory in an Italian community sample

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Randomized trial analyzes trauma symptoms in an Italian community sample, suggesting a reliable screening measure.

To assess if the Global Psychotrauma Screen total score is a valid indicator of trauma-related symptoms in an Italian community sample.
Analysed data from 6930 Italian adults recruited online during COVID-19 outbreak.
Examined unidimensionality through bifactor indices and compared one- and two-parameter logistic models.
Evaluated item fit, local dependence, and reliability using IRT models.
Bifactor indices indicated essential unidimensionality (ECVg = 0.73; ωH = 0.77).
The two-parameter logistic model showed good fit (RMSEA = 0.058, SRMSR = 0.04, TLI = 0.94, CFI = 0.94).
Item discrimination ranged from 0.68 to 3.03, indicating the scale's effectiveness in measuring trauma severity.

Bologna et al. (2026) studied this question.

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