Reliability Examination of the Modified Star Excursion Balance Test for Upper-grade Elementary School Children

[Purpose] This study examined the reliability of the modified Star Excursion Balance Test (mSEBT) for upper-grade elementary school children. [Participants and Methods] The participants were nine healthy upper-grade elementary school children. The participants performed mSEBT twice in a row. Bland-Altman analysis was performed on the results, and the intra-rater reliability and error range were calculated. [Results] The intraclass correlation coefficients (ICC) (1,1) of the three directions were in the range of 0.797–0.875. Bland-Altman analysis found fixed errors in the measures of anterior and ipsilateral posterior reach. The maximum error was 16 cm. [Conclusion] The ICC of mSEBT was high for upper-grade elementary school children. However, the error was unacceptably high compared with the measured values. Therefore, the mSEBT results of upper-grade elementary school children should be used with caution.