TABLE 3.

Results of geometry performance evaluation of drilled screw path on ovine spines.

Exp.	$d_a$ (mm) mean	$d_s$ (mm) mean	${\theta }_s$ (deg) mean	${\theta }_a$ (deg) mean	d (mm) median (IQR 25, 75)	$\theta$ (deg) median (IQR 25, 75)
1	0.12	0.63	−0.23	−0.42	1.48 (0.94, 2.00)	2.34 (1.25, 2.77)
2	−0.69	−1.09	0.69	−0.56	1.69 (1.16, 2.17)	2.45 (2.12, 3.37)
3	−0.31	0.29	−0.08	−1.06	1.39 (0.73, 2.06)	1.82 (1.20, 2.89)
Mean	−0.07	−0.06	0.19	−0.70	1.51 (0.91, 2.10)	2.30 (1.28, 3.13)
Std	1.17	1.36	1.83	1.54