Table 3.

Interitem correlation coefficient for the different measurement methods

Interitem Correlation	Tetrahedron Approximation	Semiellipsoid Approximation	TOF Measurement
Observer 1–Observer 2	0.995	0.995	0.704
Observer 1–Observer 3	0.962	0.962	0.625
Observer 2–Observer 3	0.973	0.973	0.674