Table 3 Overall reliability lumbar spinal motion parameters in the frontal and horizontal planes

Frontal plane:

ROM (°) lateral flexion

0.68

0.61

0.75

−15.4 - 15.2

8.02

Lateral flexion mean velocity (°/sec)

0.71

0.64

0.77

−9.7 - 8.4

5.11

Phase-plot Area lateral flexion (°/(°/sec))

0.7

0.63

0.77

−2368 - 2060

1228.91

Jerk index lateral flexion

0.73

0.66

0.79

−7.06 - 8.08

4.48

4Horizontal plane:

ROM (°) rotation

0.44

0.33

0.54

−25.3 - 20.1

3.54

Rotation mean velocity (°/sec)

0.53

0.43

0.62

−11.8 - 8.7

4.08

Phase-plot Area rotation (°/(°/sec))

0.5

0.4

0.6

−2455 - 1896

806.82

Jerk index rotation

0.58

0.49

0.67

−7.93 - 8.79

3.54