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[Purpose] The present study was conducted to determine the number of measurements required to establish the intraand inter-class reliabilities of measurement of the thickness of the lateral abdominal muscles using ultrasound scanning equipment. [Subjects] Thes subjects were 15 healthy males. [Methods] To assess intraclass reliability, the measurement was conducted twice by the same examiner, and once, for interclass reliability, by three different examiners. The number of measurements required to establish a high level of reliability was determined using the intraclass correlation coefficient, standard errors of measurement, and minimal clinically important difference. [Results] The interclass correlation coefficient was smaller than the intraclass correlation coefficient. Measurement errors of 0.57 to 0.77 mm were noted between the examiners, suggesting that changes of 1.59 mm for the external abdominal oblique muscle, 2.15 mm for the internal abdominal oblique muscle, and 1.77 mm for the transverse abdominal muscle or more should not be considered as measurement errors. The appropriate number of measurements was one: k=1.0. [Conclusion] The level of reliability was the highest when measurement of the thickness of the lateral abdominal muscles was performed once by the same examiner.

rigaku ryōhō kagaku/rigaku ryoho kagaku

Intraclass Correlation Coefficient and Minimal Clinically Important Difference of Lateral Abdominal Muscle Thickness in the Resting State Measured Using Ultrasound Scanning