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. 2020 Aug 17;20(1):479.
doi: 10.1186/s12888-020-02807-6.

Development and validation of a screening instrument for borderline personality disorder (SI-Bord) for use among university students

Affiliations

Development and validation of a screening instrument for borderline personality disorder (SI-Bord) for use among university students

Trustsavin Lohanan et al. BMC Psychiatry. .

Abstract

Background: The screening instrument for borderline personality disorder (SI-Bord) consists of a 5-item self-reported questionnaire on the key features of BPD from the DSM-5 using a 5-point Likert scale. This study investigated its validity and reliability in screening for BPD in university students.

Methods: A cross-sectional study was conducted on a sample of university students in Thailand between November and December 2019. An online assessment gathered demographic data and results from the SI-Bord, the Perceived Stress Scale-10 (PSS-10) and the Patient Health Questionnaire-9 (PHQ-9). Participants whose SI-Bord scores were ≥ 1 were randomly selected to be interviewed and assessed for a BPD diagnosis by four psychiatrists using the Structured Clinical Interview for DSM-IV Axis II Personality Disorders (SCID-II) as a reference point. An intraclass correlation coefficient (ICC) of 0.925 (95% CI, 0.805-0.979) ensured inter-rater reliability between the four psychiatrists. The diagnostic sensitivity and specificity of the SI-Bord, as compared to that of the SCID-II, were determined to indicate the cut-off score. The Receiver Operating Characteristics (ROC) was analyzed to evaluate its diagnostic accuracy.

Results: The study included 342 students aged 18-25 years (the mean age was 20.25 ± 1.4 years), 80.4% of whom were female. Among the 68 participants selected for an online interview, 16 were diagnosed with BPD. The cut-off score of the SI-Bord was > 9, as suggested by the Youden index, yielding a sensitivity of 56.3% and a specificity of 92.3%. It had a positive predictive value of 69.2% and negative predictive value of 87.3%. The SI-Bord had adequate discriminative power between cases and non-cases of BPD, with the area under the ROC curve being 0.83. Cronbach's alpha for the SI-Bord was 0.76, indicating acceptable internal consistency. The SI-Bord score was positively correlated to PHQ-9 and PSS-10 scores (r = 0.67 and r = 0.69, p < 0.001, respectively) and negatively correlated to MSPSS (r = - 0.50, p < 0.001). The prevalence of BPD in the sample was 6.4%, according to the cut-off score > 9.

Conclusion: The SI-Bord demonstrated good reliability and validity for screening BPD in university students. However, a study in non-Thai and other population groups should be warranted.

Keywords: Borderline personality disorder; Instrument; Screening; Undergraduate; Validation.

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Conflict of interest statement

Tinakon Wongpakaran is an Associate Editor of BMC Psychiatry. All the authors declare that they have no competing interests.

Figures

Fig. 1
Fig. 1
Flow chart of the study. SI-Bord = Screening instrument for borderline personality disorder, r-MSPSS = Revised Thai Multi-Dimensional Scales of Perceived Social Support, TPSS = Thai version of perceived stress scale, PHQ-9 = Patient health questionnaire-9
Fig. 2
Fig. 2
ROC curve with 95% Confidence Inerval for the SI-Bord. dotted lines = upper and lower confidence limit of the SI-Bord, bold line = SI-Bord score, AUC = area under the curve

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