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No measure has formally been developed to assess the published ICD‐11 model of Personality Disorder (PD) severity. We therefore set out to develop and evaluate the 14‐item Personality Disorder Severity ICD‐11 (PDS‐ICD‐11) scale.

A representative U.S. community sample (N = 428; 50.9% women) and a New Zealand mental health sample (N = 87; 61.5% women) completed the PDS‐ICD‐11 scale along with a series of established PD and impairment measures.

Item response theory supported the unidimensionality of PDS‐ICD‐11 (median item loading of 0.68) and indicated that a PDS‐ICD‐11 score of 17.5 may serve as a benchmark for pronounced dysfunction. Correlation and regression analyses supported both criterion validity and incremental validity in predicting impairment and PD symptoms. The PDS‐ICD‐11 was particularly associated with measures of Level of …