Reliability and validity of the 20-item taiwan version of the borderline personality inventory.
BACKGROUND
The Borderline Personality Inventory (BPI) is a self-reported questionnaire for screening patients with borderline personality disorder. This study aims to construct and validate a shorter version of the original 53-item BPI suitable for use in Taiwan.


METHODS
A two-stage translation of the BPI was conducted and modified into colloquial language for use in Taiwan. It was tested against 3 groups of patients (borderline personality disorder, schizophrenia, neurotic disorders) and healthy subjects. After item analyses, a 20-item BPI was selected (BPI-T20), and its internal consistency was assessed. The validity was examined using relative operating characteristic (ROC) analysis.


RESULTS
Altogether, 544 subjects successfully completed the study. The Cronbach's alpha coefficient was 0.92, while 3 factors were extracted from the questionnaire. The BPI-T20 had significant discriminatory power with satisfactory validity for borderline personality disorder, with an area under the ROCcurve of 0.93 at a cut-off point of 11/12. The sensitivity and specificity were 89.8% and 82.8% respectively, with a misclassification rate of 14.7%.


CONCLUSIONS
The BPI-T20 appears to be reliable, effective and valid in screening borderline personality disorder. It could be applied in large-scale epidemiological community surveys.
Lee
Chun-Yi
CY
Department of Psychiatry, Chang Gung Memorial Hospital-Kaohsiung Medical Center, Chang Gung University College of Medicine, Kaohsiung, Taiwan.
Wen
Jung-Kwang
JK
Yeh
Wei-Chiang
WC
Lee
Yu
Y
Chong
Mian-Yoon
MY
D000328:Adult; D001883:Borderline Personality Disorder / Q000175:diagnosis*; D005260:Female; D006801:Humans; D008297:Male; D010555:Personality Inventory; D013624:Taiwan