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Table 4 Intraobserver agreement

From: Reliability of preoperative MRI findings in patients with lumbar spinal stenosis

Parameter

Observer 1

Observer 2

Observer 3

Observer 4

Lee grade

0.97 (0.96–0.99)

0.84 (0.81–0.88)

0.91 (0.88–0.93)

0.95 (0.93–0.97)

Schizas grade

0.86 (0.80–0.93)

0.80 (0.73–0.88)

0.78 (0.70–0.85)

0.98 (0.96–1.00)

Weishaupt grade

0.91 (0.89–0.94)

0.72 (0.66–0.78)

0.63 (0.56–0.70)

0.97 (0.95–0.99)

Redundant nerve roots (RNR)

0.95 (0.91–0.98)

0.78 (0.72–0.85)

0.90 (0.86–0.94)

0.95 (0.92–0.99)

Intraspinal cysts

0.99 (0.98–1.00)

0.97 (0.95–0.98)

0.99 (0.99–1.00)

1.00 (1.00–1.00)

DSCA

0.98 (0.98–0.99)

0.93 (0.91–0.94)

0.96 (0.95–0.97)

1.00 (1.00–1.00)

  1. Gwet’s agreement coefficient (AC1) is used for calculating the intraobserver agreement for the categorical parameters and Intraclass Correlation Coefficient (ICC) for the DSCA (Dural Sac Cross-sectional Area). 95% confidence intervals are given in the parentheses