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Measuring physical fitness in Persons with Severe/Profound ...

Measuring physical fitness in Persons with Severe/Profound ...

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Data analysisThe data were analyzed us<strong>in</strong>g SPSS 14.0. First, to determ<strong>in</strong>e whether significant differencesbetween test and retest measurements exist, we analyzed the differences us<strong>in</strong>g the Wilcoxonsigned rank test. The level of statistical significance was set at 0.05. Limits of agreement (LOA)between two measurements of the same variables were calculated accord<strong>in</strong>g to the proceduredescribed by Bland and Altman [24]. The LOA is considered to be an <strong>in</strong>dicator of reliability. LOAsare expressed <strong>in</strong> units and as a percentage of the mean of the first measurement. Measurementswere considered reliable when the LOA was less than 10% of the mean of the first measurement.Afterward, the <strong>in</strong>traclass correlation coefficients (ICC; two-way random, absolute agreement)of test and retest measurements of the same variables were computed. Measurements wereconsidered reliable when the ICC values were greater than 0.80 and the 95% confidence <strong>in</strong>terval(CI) was 0.30 or less. F<strong>in</strong>ally, the test-retest was considered reliable if (1) there were no significantdifferences between test and retest measurements; (2) LOA was acceptable, as described above;and (3) ICC was acceptable, as described above.ResultsValidity studyThe characteristics of the subjects that participated <strong>in</strong> the validity study are shown <strong>in</strong> Table 1.Table 1. Validity study: subject characteristicsGenderBMI category

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