Table 1: Segmental Distribution of Effective Doses in Epidural und Periradicular Lumbar Injections

Procedure Number of Injections n Mean Effective Dose mSv Confidence Interval 95% Median eff. Dose mSv Standard Deviation
EDU L 1/2 9 1.04 0.62-1.46 0.87 0.55
EDU L 2/3 142 1.31 1.21-1.40 1.14 0.57
EDU L 3/4 295 1.36 1.28-1.45 1.11 0.74
EDU L 4/5 563 1.37 1.30-1.44 1.13 0.80
EDU L 5/s1 277 1.29 1.21-1.38 1.13 0.70
Radix L1 0 - - - -
Radix L2 22 1.25 1.05-1.45 1.17 0.46
Radix L3 44 1.3 1.11-1.48 1.14 0.61
Radix L4 131 1.27 1.18-1.36 1.17 0.50
Radix L5 322 1.46 1.37-1.54 1.22 0.81
Radix S1 65 1.33 1.17-1.50 1.11 0.68