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Table 3 Internal consistency, inter-rater agreement, and test-retest reliability of the Spanish version of the DN4 questionnaire.

From: Validity and reliability of the Spanish version of the DN4 (Douleur Neuropathique 4 questions) questionnaire for differential diagnosis of pain syndromes associated to a neuropathic or somatic component

  Inter-rater agreement
  Rater A Rater B ICC (95% CI) Kappa§ (95% CI)
Total sample (n = 158) 4.1 (2.3) 4.2 (2.5) 0.926 (0.899–0.946) 0.79 (0.69–0.89)
NP (n = 99) 5.0 (2.2) 5.1 (2.4) 0.925 (0.888–0.949) 0.68 (0.49–0.86)
NNP (n = 59) 2.6 (1.8) 2.7 (2.0) 0.840 (0.730–0.905) 0.72 (0.50–0.93)
  Internal consistency (Cronbach's α1)   
  0.65 0.71   
  Test-retest reliability
  Test Re-test ICC (95% CI) Kappa§ (95% CI)
Retest sample (n = 67) 3.7 (2.5) 3.6 (2.6) 0.949 (0.916–0.969) 0.79 (0.64–0.94)
NP (n = 37) 4.7 (2.4) 4.4 (2.5) 0.952 (0.904–0.976) 0.75 (0.53–0.98)
NNP (n = 30) 2.5 (2.0) 2.7 (2.4) 0.923 (0.840–0.963) 0.78 (0.56–1.00)
  1. NP = Neuropathic Pain, NNP = Non-Neuropathic Pain (somatic), ICC = Intra-class Correlation Coefficient, 95% CI = 95% confidence interval, 1Coefficients for the entire questionnaire (10 items) p > 0.05 between raters (Friedman's paired test), p < 0.001 (p value for intra-class correlation coefficient), §Kappa using a cut-off value > 4 pts.