Table 3. Surgery details.

Mean (±SD) surgery duration (min)	136.8 (±50.4)
One level	127.7 (±43.5)
Two level	182.0 (±58.3)
Mean (±SD) estimated blood loss (mL)	175.8 (±160.1)
One level	163.9 (±139.7)
Two level	233.1 (±229.0)
Blood transfusion, n (%)	1 (0.4)
Mean (±SD) total fluoroscopy time (sec)	122 (±130.7)
One level	115.1 (±123.9)
Two level	154.1 (±156.6)
Navigation system used, n (%)
Pre-CT	9 (3.6)
3D fluoroscopy	4 (1.6)
Image fusion technique	6 (2.4)
O-arm imaging	14 (5.6)
Prophylactic antibiotics prescribed, n (%)	248 (98.4)