Table 3.

Intra-observer reproducibility of the constrained and non-constrained Cobb techniques for each observer based on intra-class correlation coefficients (95% confidence interval)

Measuring technique	Thoracic kyphosis			Lumbar lordosis
	Observer 1	Observer 2	Observer 3	Observer 1	Observer 2	Observer 3
Non-constrained Cobb	0.74 (0.49–0.87)	0.90 (0.79–0.95)	0.92 (0.84–0.96)	0.97 (0.94–0.99)	0.97 (0.93–0.98)	0.90 (0.80–0.95)
Constrained Cobb	0.80 (0.60–0.90)	0.81 (0.65–0.91)	0.92 (0.83–0.96)	0.95 (0.90–0.98)	0.96 (0.91–0.98)	0.87 (0.72–0.94)