BPD feature scores were measured using the MSI-BPD [45], which has been confirmed to have good validity and high internal consistency for Chinese adolescents [46]. According to Leung et al., MSI-BPD can be conceptually divided into three major domains: affect dysregulation, impulsivity, self and interpersonal disturbances [46]. The MSI-BPD comprises 10 items, each scored on a 2-point scale, with higher scores demonstrating higher severity of BPD features. In the current sample, high internal consistency of the measure was found (α = 0.84).
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