Table 2.

Intra-observer variability

	Examiner 1		Examiner 2
	Inclinometer ICC (95% CI)	Flock of birds ICC (95% CI)	Inclinometer ICC (95% CI)	Flock of birds ICC (95% CI)
Flexion	0.79 (0.39–0.94)	0.84 (0.52–0.96)	0.86 (0.57–0.96)	0.91 (0.69–0.98)
Extension	0.92 (0.74–0.98)	0.93 (0.76–0.98)	0.89 (0.62–0.97)	0.89 (0.63–0.97)
Right lateral bending	0.70 (0.21–0.92)	0.60 (0.03–0.88)	0.80 (0.40–0.95)	0.69 (0.18–0.91)
Left lateral bending	0.84 (0.51–0.96)	0.70 (0.21–0.72)	0.84 (0.51–0.96)	0.82 (0.44–0.95)
Right axial rotation		0.87 (0.58–0.97)		0.75 (0.30–0.93)
Left axial rotation		0.75 (0.30–0.93)		0.81 (0.43–0.95)

Intra-class correlation coefficient values (ICC) and 95% confidence intervals (CI) for the inclinometer and the magnetic tracking device methods used by both examiners