“…Timed stair tests appear to have moderate validity as a functional measure, with correlations being present to other functional measures (e.g., timed up-and-go test [15,23], walking speed [14,[28][29], sit to stand [14,30], alternate step [14]). Functional tests (e.g., timed up-andgo and sit to stand) all appear to be composite measures of strength and balance [31][32][33], and stair tests are no different, correlating to balance tests (functional reach test [15,23], timed one-legged stance [15], coordinated stability [14], near tandem balance [14]), and strength [9,28,[34][35].…”