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Table 3: 
Demographic features of low- and high-concentration-anesthetic groups
FeatureAnesthetic Concentration
0.25% Bupivacaine0.5% Bupivacaine
Patientsa (No.)175131
Gender, female (No.) (%)96 (55%)68 (52%)
Average age (yr)45.752.8
Average pain duration (yr)2.853.14
LBP only (No.) (%)45 (26%)43 (33%)
LBP+leg pain (No.) (%)122 (70%)83 (63%)
Leg pain only (No.) (%)8 (4%)5 (4%)
Injections (No.)237155
Average anesthetic injection volume (cc)1.982.02
VAS: Pre-LESI (average)5.845.63
VAS: Post-LESI (average)2.261.87
  • ↵a 30 patients with multiple injections received different anesthetic strength on different LESIs.