Table 3 Main statistical analyses and interpretation of statistics

 Pearson’s

Relative

< 0.60

0.60–0.79

≥0.80

 Spearman’s

Relative

< 0.60

0.60–0.79

≥0.80

 Kendall’s

Relative

< 0.60

0.60–0.79

≥0.80

 Intraclass correlation coefficient

Absolute

< 0.60

0.60–0.69

≥0.70

Linear Regression (% variance explained by the measurement tool)

Relative

< 60%

60–79%

≥80%

Root mean squared error

Absolute

*

*

*

Bland Altman (mean difference, limits of agreement, bias)

Absolute

*

*

*

Kappa (r)

Absolute

< 0.60

0.60–0.69

≥0.70

Area under the receiver operating curve (AUC-ROC)

Relative

< 0.70

0.70–0.79

≥0.80

< 60%

60–79%

80–100%