In order to confirm the validity of the FOPR test, Bland–Altman analysis was performed to assess the agreement between the z-score of the conventional tests and that of the FOPR variables among the HSN+SS group [22]. The mean difference between z-scores of FOPR variables and conventional tests was set to zero since the values of tests were standardised into z-scores. Limits of agreements were obtained at the mean ± 1.96 standard deviation. For the 95% confidence interval, we had 18 degrees of freedom and t distribution = 2.101. Accordingly, confidence intervals were obtained as the mean ± 2.101 standard error.

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