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Table 2 The intra- and inter-observer agreement between two radiologists of quantitative MRI measurements

From: The SP-ET index is a new index for assessing the vertical position of patella

Quantitative parameters

Intra-observer

Inter-observer

ICCs (95% CI)

f value

p value

ICCs (95% CI)

f value

p value

SP-ET index

0.930 (0.863–0.964)

14.088

< 0.001

0.890 (0.799–0.945)

8.855

< 0.001

Insall–Salvati ratio

0.875 (0.754–0.936)

7.846

< 0.001

0.973 (0.943–0.987)

38.141

< 0.001

  1. SP-ET index the most superior point of patella-entrance of femoral trochlea distance ratio, ICCs intraclass correlation coefficients, CI confidence interval