Table 4.

Multivariate analysis of the impact of patient and procedural demographics on fluoroscopy time.

Variable	Coefficient (β)	P value
Age	−0.04	0.583
BMI Classifications	1.97	0.17
Sex
Female	Reference
Male	−8.4	0.6
Trainee Involvement
No	Reference
Yes	3.2	0.87
Number of Levels
1	−149.4	0.002
2	−106.4	<0.001
3	−82.1	0.004
4	Reference
Involvement of S1
No	Reference
Yes	4.3	0.86
Stages of Practice
1st
2nd	−78	0.02
3rd	−104.8	0.001
4th	−60.7	0.052
5th	−109.9	<0.001