Table 4 Comparison of model estimates and reference standards for sagittal intervertebral rotational motion (°)

 C2/3

0.86 (0.79, 0.91)

0.88 (0.83,0.92)

−0.52

1.57

1.64 (1.44,1.90)

1.23 (1.01,1.45)

 C3/4

0.93 (0.90,0.95)

0.93 (0.90, 0.96)

0.04

1.70

1.70 (1.49,1.97)

1.22 (0.99,1.46)

 C4/5

0.93 (0.90,0.95)

0.93 (0.90, 0.96)

0.14

2.02

2.01 (1.77,2.33)

1.57 (1.32,1.82)

 C5/6

0.94 (0.91, 0.96)

0.94 (0.91, 0.96)

−0.22

2.10

2.11 (1.85,2.45)

1.59 (1.32,1.87)

 C6/7

0.95 (0.92, 0.96)

0.95 (0.92, 0.96)

−0.22

1.68

1.69 (1.48,1.96)

1.29 (1.08,1.51)

 C2/3

0.73 (0.62, 0.81)

0.74 (0.64, 0.82)

0.07

1.79

1.78 (1.56,2.07)

1.40 (1.18,1.62)

 C3/4

0.87 (0.81, 0.92)

0.88 (0.83, 0.92)

0.55

1.75

1.83 (1.61,2.12)

1.37 (1.13,1.61)

 C4/5

0.84 (0.77, 0.89)

0.85 (0.78, 0.90)

0.17

2.27

2.27 (1.99,2.63)

1.69 (1.39,1.99)

 C5/6

0.87 (0.84, 0.92)

0.89 (0.84, 0.93)

−0.18

2.05

2.05 (1.80,2.38)

1.66 (1.42,1.90)

 C6/7

0.93 (0.90, 0.95)

0.93 (0.90, 0.95)

−0.14

1.50

1.50 (1.32,1.74)

1.19 (1.00,1.37)

 C2/3

0.60 (0.46, 0.71)

0.61 (0.46, 0.72)

−0.18

1.61

1.61 (1.41,1.87)

1.21 (1.00,1.43)

 C3/4

0.88 (0.82, 0.92)

0.88 (0.83, 0.92)

−0.46

1.66

1.71 (1.50,1.98)

1.34 (1.13,1.55)

 C4/5

0.87 (0.81, 0.91)

0.87 (0.81, 0.91)

−0.12

2.05

2.05 (1.80,2.38)

1.49 (1.21,1.77)

 C5/6

0.80 (0.72, 0.86)

0.81 (0.73, 0.87)

0.22

1.98

1.99 (1.75,2.31)

1.43 (1.16,1.71)

 C6/7

0.73 (0.62, 0.81)

0.75 (0.65, 0.82)

0.02

1.60

1.59 (1.40,1.85)

1.28 (1.10,1.47)