Intraclass and interclass reliability of BS-POP

Abstract

[Purpose] This study aimed to examine the reliability of measurement using the Brief Scale for Evaluation of Psychiatric Problems in Orthopedic Patients (BS-POP). [Materials] There are patient and doctor versions of the BS-POP; the subjects were 10 patients with chronic back pain for the former version, and 42 with lumbar disc herniation for the latter. [Methods] The intraclass and interclass reliabilities of both versions were examined. Each question item was analyzed based on the kappa and rank correlation coefficients and level of concordance. [Results] The ICC (1,1) of the patient version was 0.98, and that of the doctor version was 0.90. The ICC (2,1) of the doctor version was 0.87. A moderate or better correlation was indicated by the kappa or rank correlation coefficient or 81% or higher concordance rate was shown for all question items except 2 in the doctor version. [Conclusion] The degree of overall reliability of measurement using the BS-POP was high, while the degree of interclass reliability was found to be low in some items of the doctor version.