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The regression relationships between the performance tests were obtained.
In this study there is an association between the performance tests and length of stay; and, using the equations, we can indeed predict one from the other.
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This study investigated the association between three performance test outcomes of four activities (pain, exertion, and time or distance; for self-paced walk, stair test, timed up-and-go, 6-minute walk) with self-reports of physical function (WOMAC Physical Function subscale and LEFS) and the association between the change scores of the performance tests and those of the self-report measures.
Questionnaires will be interspersed between the physical performance tests, and participants will be able to rest between tests if required.
Despite extensive literature on this topic, the nature of the association between physical performance tests and self-reported limitations has remained incompletely characterized.
Univariable regression analyses were also used to establish the associations between performance tests of physical function and disease activity (BASDAI) as well as between performance tests and impairments in mobility of the hips and spine (BASMI).
The association between performance tests and BASDAI was low with a R-square of 0.08 and Beta of 0.28 for tests 1 to 6 plus 8 and a R-square of 0.00 with a Beta close to zero (-0.06; P = 0.534) for test 7.
Moreover, there is not much correlation between the performance and test number (Spearman rank correlation coefficient: 0.2911; P value: 0.0471).
In contrast to many previous studies, we used highly specific pairings to provide a more valid test of the relationship between physical performance tests and self-reported physical function, thereby minimizing problems of compensability and the risk of confounding across different domains of physical functioning.
Table 3 shows the results of the univariable associations between performance tests and BASDAI as well as BASMI.
Moreover, the strong relationship between physical performance tests and negative health-related outcomes in the elderly has already been documented[ 4, 6, 33, 34].
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