What is the MDC for the single leg hop for distance?

What is the MDC for the single leg hop for distance?

• A. 8.50 cm
• B. 10.25 cm
• C. 11.40 cm
• D. 12.78 cm

Answer: (D)

Minimal Detectable Change (MDC) is the smallest amount of change in a test result that’s likely to reflect a real difference, not just measurement variability, and it’s usually set at 95% confidence. For the single leg hop for distance, MDC95 is calculated from the test’s reliability data: MDC95 = 1.96 × sqrt(2) × SEM, with SEM = SD × sqrt(1 − ICC). Using typical reliability values for this hop distance test, SEM is about 4.6 cm, so MDC95 ≈ 2.77 × SEM ≈ 12.7 cm. That lines up with the 12.78 cm figure, meaning a change of roughly 12.8 cm or more is needed to be 95% confident that real improvement occurred beyond measurement error. Smaller changes are likely within the test’s variability and may not indicate true change.

Minimal Detectable Change (MDC) is the smallest amount of change in a test result that’s likely to reflect a real difference, not just measurement variability, and it’s usually set at 95% confidence. For the single leg hop for distance, MDC95 is calculated from the test’s reliability data: MDC95 = 1.96 × sqrt(2) × SEM, with SEM = SD × sqrt(1 − ICC). Using typical reliability values for this hop distance test, SEM is about 4.6 cm, so MDC95 ≈ 2.77 × SEM ≈ 12.7 cm. That lines up with the 12.78 cm figure, meaning a change of roughly 12.8 cm or more is needed to be 95% confident that real improvement occurred beyond measurement error. Smaller changes are likely within the test’s variability and may not indicate true change.