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Example 2 × 2 contingency table to illustrate how groups were identified to calculate specificity. The italicized qualifiers for poor and good physical function were changed iteratively to determine the specificity over a range of performance on the clinical tests of physical function.
| Inactive (< 6000 steps/day) | Active (≥ 6000 steps/day) | |
|---|---|---|
| Poor physical function (five times sit to stand test in > 10 sec) | a | b |
| Good physical function (five times sit to stand test in < 10 sec) | c | d |
