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 2

X-ray and flexicurve measurements of the thoracic and lumbar curvature.

Curvature	X-ray mean (SD) range	Flexicurve mean (SD) range	Difference mean (SD) range	Absolute difference mean (SD)	≤5°; 𝑛	5^∘<𝑥≤10^∘; 𝑁	>10°; 𝑁
Thoracic	43.7 (11.0)	42.9 (8.8)	0.8 (8.1)	6.5 (4.7)	26	12	9
	18° to 71°	26° to 65°	−16° to 16°
Lumbar	40.5 (10.1)	40.0 (7.9)	0.5 (8.3)	6.8 (4.6)	23	13	11
	22° to 62°	21° to 59°	−17° to 16°