Table 2 Intra- and inter-observer reliability and agreement of IV-RoMmax and initial attainment rate measurements during weight-bearing flexion and return n = 10

Inter-vertebral level

Intra-observer ICC (95 % CI)

Inter-observer ICC (95 % CI)

Intra-observer SEM (°)

Inter-observer SEM (°)

L2-L3

0.98 (0.92–1.0)

0.94 (0.80–0.99)

0.45

0.76

L3-L4

0.99 (0.96–1.0)

0.99 (0.67–1.0)

0.23

0.24

L4-L5

0.99 (0.97–1.0)

0.98 (0.93–1.0)

0.39

0.59

L5-S1

0.96 (0.82–0.99)

0.99 (0.94–1.0)

0.54

0.61

Inter-vertebral level

Intra-observer ICC (95 % CI)

Inter-observer ICC (95 % CI)

Intra-observer SEM_ratio

Inter-observer SEM_ratio

L2-L3

0.95 (0.78–0.99)

0.95 (0.80–0.99)

0.026

0.036

L3-L4

0.98 (0.92–1.0)

0.84 (0.49–0.96)

0.02

0.033

L4-L5

0.92 (0.71–0.98)

0.91 (0.70–0.98)

0.032

0.018

L5-S1

0.95 (0.81–0.99)

0.88 (0.53–0.97)

0.023

0.019