Validity and Reproducibility of the Measurements Obtained Using the Flexicurve Instrument to Evaluate the Angles of Thoracic and Lumbar Curvatures of the Spine in the Sagittal Plane

Table 1

Intraclass Correlation Coefficient (ICC) between the evaluations of the thoracic and lumbar curvatures measured with the flexicurve performed by three different evaluators (Eva1, Eva2, and Eva3) and between the first and second evaluation days performed by the same evaluator (day1, day2).

		95% Confidence interval
	ICC	Inferior limit	Superior limit	P
Thoracic (Eva1, Eva2, and Eva3)	0.942	0.865	0.979	<0.001
Lumbar (Eva1, Eva2, and Eva3)	0.831	0.604	0.938	<0.001
Eva1 (day1) × Eva1 (day2): Thoracic	0.829	0.565	0.939	<0.001
Eva1 (day1) × Eva1 (day2): Lumbar	0.783	0.468	0.922	<0.001