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Table 4 Results of First Step of Algorithm (Determining if a surgical case represents one of the four procedure/indication combinations of interest)

From: Validation of an electronic coding algorithm to identify the primary indication of orthopedic surgeries from administrative data

Procedure/Indication

Sensitivity (95% Confidence Interval)

Specificity (95% Confidence Interval)

Lumbar Spinal Surgery/Lumbar Herniated Disc

0.96 (0.87, 1.00)

0.74 (0.69, 0.79)

Lumbar Spinal Surgery/Lumbar Spinal Stenosis

0.91 (0.85, 0.95)

0.82 (0.77, 0.87)

Knee Arthroplasty/Knee Osteoarthritis

0.97 (0.92, 0.99)

0.84 (0.80, 0.88)

Hip Arthroplasty/Hip Osteoarthritis

0.99 (0.96, 1.00)

0.87 (0.83, 0.91)

  1. Note: “Exact” Clopper-Pearson Confidence Intervals are used