Table 2.

Comparisons of the flexibility indices among the different radiographs

Radiographs	Mean	SD	95% CI of the difference		p value
			Lower	Upper
Supine FI–Traction FI	−16.1	7.7	−19.2	−12.9	<0.001
Supine FI–Intraop. FI	−14.6	8.9	−18.3	−11	<0.001
Traction FI–Intraop. FI	1.4	6.9	−1.4	4.3	0.308

FI flexibility index, SD standard deviation, CI confidence interval