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Table 1: Cohort and procedural demographics
Demographics 
Mean age (range) 57 (12–96)
Sex Male = 75
Female = 104
Level of gold fiducial marker placement C7 = 1
T1 = 5
T2 = 5
T3 = 14
T4 = 14
T5 = 18
T6 = 21
T7 = 26
T8 = 21
T9 = 15
T10 = 19
T11 = 15
T12 = 7
L3 = 1
L4 = 1
Method CT = 36
FL  = 143
Mean radiation dose (range) (mGy) 183.43 (13–805)
Mean FL time (range) (min) 3.92 (0.4–15.2)
No. of wrong-level surgeries 0
No. of different radiologists who performed a gold fiducial marker placement 13
Mean BMI (range) 28.9 (16.1–55.8)
Osteoporosis diagnosis No = 159
Yes = 20
Trainee present? No = 107
Yes = 72
Mean procedure duration (range) (min)^{^a} 51.9 (20–114)
Mean No. of days when operation was performed after placement (range) 3.6 days (0–92)
Note:—BMI indicates body mass index.
↵a Entry of the room by physician to room exit time.