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Table 3 Diagnostic accuracy of HIA01 screening tool sub-tests compared if baseline thresholds applieda

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

Sub-testTPFNFPTNSensitivity (%, 95% CI)Specificity (%, 95% CI)AUROC (95% CI)
Maddocks questions36398136048.3 (5.9–11.3)97.9 (96.4–98.9)0.5 (0.5–0.6)
Immediate memory753597154617.3 (13.8–21.2)88.5 (85.7–90.0)0.5 (0.5–0.6)
Digits backwards1452899352433.4 (29.0–38.1)84.9 (81.9–87.7)0.6 (0.6–0.6)
Tandem gait20323126834946.8 (42.0–51.6)56.6 (52.5–60.5)0.5 (0.5–0.6)
Symptoms2112235056748.6 (43.8–53.4)91.6 (89.5–93.9)0.76 (0.7–0.7)
Delayed recall15827611550236.4 (31.9–41.1)81.4 (78.1–84.4)0.6 (0.6–0.66)
Clinical signsb1892594362742.2 (37.6–46.9)93.6 (91.5–95.3)0.7 (0.7–0.7)
  1. TP true positive, FN false negative, FP false positive, TN true negative, AUROC area under the curve of the receiver operating characteristic
  2. aBaseline threshold = any worsening in off-field screening sub-test performance compared to previous baseline value
  3. bSub-test does not have normative or baseline threshold