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Table 2: 
Diagnostic value of DSNRB with the cutoff value for positive result set at 70%
EstimateAll PatientsPatients Without Two Findings* on Spot Radiographs
Sensitivity57% (27/47)71% (25/35)
(42, 72)†(54, 85)†
Specificity86% (50/58)91% (43/47)
(75, 94)†(80, 98)†
Accuracy73% (77/105)83% (68/82)
(64, 81)†(73, 90)†
Positive predictive value77% (27/35)86% (25/29)
(60, 90)†(68, 96)†
Negative predictive value71% (50/70)81% (43/53)
(59, 82)†(68, 91)†
  • * Two findings indicate inadequate blocks (including insufficient infiltration, insufficient passage, and intraepineural injection) and overflow.
  • † Shown in parentheses are 95% confidence intervals.