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Table 3 Correlation between the relevant operative data and ultrasonographic data

From: The correlation between pre-operative ultrasonographic median nerve evaluation and the operative procedure in CTS

Correlation variables Flattening ratio PS-PQ CSA
r P r P
Need for neurolysis 0.69 < 0.0001 0.21 0.16
Need for approach extension 0.42 0.0205 0.68 0.0001
  1. Spearman Correlation P probability, r correlation coefficient
  2. r = 0–0.2, very low and probably meaningless; r = 0.2–0.4, a low correlation
  3. r = 0.4–0.6, a reasonable correlation; r = 0.6–0.8, a high correlation
  4. r = 0.8–1.0, a very high correlation; P < 0.05 = significant