Table 1 Data sets used in different tests for reliability, with “O”, “S”, “R”, and “M” represent “Operator”, “Scan”, Rater”, and “Measurement”, respectively (Fig. 6). Each set of result is represented as “O*S*R*M*”. For example, “O1S2R2M2” represents the result obtained from the second measurement of Rater 2 for the image obtained during second scanning of the Operator 1

Intra-rater

O*S1R*M1, O*S1R*M2

Table 1

Tests between the two measurements by each rater (R*) using the first scan of each operator (O*), and for each region (thoracic and lumbar)

Intra-operator

O*S1R*M1, O*S2R*M1

Table 2

Tests between the two scans obtained by each operator (O*), using the first measurements of each other three raters (R*), and for each region

Inter-rater

O*S1R1M1, O*S1R2M1, O*S1R3M1

Table 3

Tests among the first measurements of the three raters using the first scan of each operator (O*), and for each region.

Inter-operator

O1S1R*M1, O2S1R*M1

Table 4

Tests between the two operators using the first scan, with the first measurement of each of three raters, and for each region