Table 1.

Ratings of correlations, effect sizes, and coefficients.

Parameter	Grading
ICC	<0.5	– Poor
	0.5–0.75	– Moderate
	0.76–0.89	– Good
	≥0.9
CCC	<0.90	– Poor
	0.9–0.95	– Moderate
	0.96–0.98	– Substantial
	≥0.99	– Almost perfect
Pearson's and Spearman's r	0	– No correlation
	0.1–0.3	– Weak
	0.4–0.6	– Moderate
	0.7–0.9	– Strong
	1	– Excellent
Cohen's d	< 0.2	– Negligible
	0.2-<0.5	– Small
	0.5-<0.8	– Medium
	≥0.8	– Large
CV	≤ 20%	– Acceptable
	>20%	– Poor
Own terminology
No correlation, negligible	– No correlation
Poor, weak, small	– Low
Moderate, medium	– Middle-sized
Good, substantial, strong, large	– High
Excellent, almost perfect	– Very high
Acceptable	– Acceptable
Poor	– Poor

ICC, intraclass correlation coefficient; CCC, concordance correlation coefficient.