The Role of Thoracic Medial Branch Blocks in Managing Chronic Mid and Upper Back Pain: A Randomized, Double-Blind, Active-Control Trial with a 2-Year Followup

Table 5

Opioid intake (morphine equivalence mg).

Narcotic intake	Group I (50)	Group II (50)
(Morphine equivalence mg)	Mean ± SD	Mean ± SD
Baseline	48.0±53.75	47.9±48.6
3 months	38.0±44.2	40.3±33.9
6 months	38.2±46.1	39.3±34.8
12 months	37.6±38.4	37.8±33.2
18 months	37.6±46.4	38.7±35.2
24 months	37.6±46.4	38.7±35.2
Group difference	0.899
Time difference	0.108
Group by time interaction	0.999