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Table 2 Comparison of removal- from-play and theoretical HIA01 screening tool performance

From: The performance of the World Rugby Head Injury Assessment Screening Tool: a diagnostic accuracy study

Index testTPFNFPTNSensitivity
(%, 95% CI)
Specificity
(%, 95% CI)
AUROC
(95% CI)
Real-life removal- from-play decisionsa3431059058076.6 (72.4–80.4)86.6 (83.7–89.1)0.8 (0.8–0.8)
HIA01 screening toolb (baseline thresholds)3894540820989.6 (86.4–92.3)33.9 (30.1–37.8)0.6 (0.6–0.6)
HIA01 screening toolc (normative thresholds)3608820846280.4 (76.4–83.9)69.0 (65.3–72.4)0.8 (0.7–0.8)
  1. TP true positive, FN false negative, FP false positive, TN true negative, AUROC area under the curve of the receiver operating characteristic
  2. aIndex test: removed from play v returned to play
  3. bIndex test: any sub-test score worse than baseline value v no sub-test score worse than baseline value and no subjective clinical signs of a possible concussion
  4. cIndex test: any sub-test score worse than normative threshold v no sub-test score worse than a normative threshold and no subjective clinical signs of a possible concussion