Table 4. Reliability of Quantitative Measurements: Intraclass Correlation Coefficients (ICC).

	Intra-ICC
Measurement	Reader E	Reader F	Inter-ICC
Max AP canal length—ST canal	0.63 (0.44-0.77)	0.9 (0.83-0.94)	0.76 (0.68-0.82)
Max AP canal width—ST canal	0.92 (0.87-0.95)	0.93 (0.89-0.96)	0.9 (0.86-0.92)
Max AP canal length—osseous canal	0.7 (0.53-0.81)	0.86 (0.77-0.92)	0.65 (0.55-0.74)
Max AP canal width—osseous canal	0.9 (0.83-0.94)	0.86 (0.78-0.92)	0.68 (0.58-0.75)
Osseous canal area	0.71 (0.55-0.82)	0.88 (0.8-0.93)	0.58 (0.47-0.68)
ST canal area	0.77 (0.64-0.86)	0.94 (0.9-0.97)	0.78 (0.71-0.83)
Thecal sac area	0.86 (0.76-0.91)	0.9 (0.83-0.94)	0.76 (0.68-0.82)
Canal area at pedicle above	0.57 (0.35-0.73)	0.77 (0.63-0.86)	0.63 (0.52-0.73)
Thecal sac area at pedicle above	0.28 (0-0.51)	0.86 (0.77-0.92)	0.63 (0.52-0.72)

Intra-reader variables collected on 18 patients 3 levels each. Inter-reader variables collected on 52 images 3 levels each. ICC and 95% CI based on Shrout-Fleiss formulas.