Table 4.

Rating used for each measurement property evaluated.

Rating	Reliability56	Content validity	Construct validity	Clinical applicability
Excellent	0.90 ≤ ICC	0 item†	p ≤ 0.001	0 item‡
Good	0.75 ≤ ICC < 0.90	1 item†	0.010 ≤ p < 0.001	1 item‡
Moderate	0.50 ≤ ICC < 0.75	2 items†	0.050 ≤ p < 0.010	2 items‡
Poor	ICC < 0.50	3 items†	0.05 < p	3 items‡

^†Irrelevant or not sufficiently defined items regarding the construct to be assessed (e.g. population, instrument, parameter, outcome).

^‡Weak items (e.g. cost, simplicity of setup and execution, task-related pain).