Table 5.

Multivariate analysis of the impact of patient and procedural demographics on cumulative radiation dose.

Variable	Coefficient (β)	P value
Age	−0.25	0.58
BMI Classifications	5.15	<0.001
Sex
Female	Reference
Male	−20.7	0.07
Trainee Involvement
No	Reference
Yes	−0.2	0.99
Number of Levels
1	−40.2	0.19
2	−20.2	0.17
3	−42.6	0.1
4	Reference
Involvement of S1
No	Reference
Yes	38.5	0.03
Stages of Practice
1st	Reference
2nd	12.8	0.57
3rd	−14.3	0.49
4th	−18.1	0.39
5th	−25.8	0.16