Table 2.

Cognitive and Symptom Classification Accuracy

	<6 h	7 d
Cognitive measures
Cogstate
Detection	0.69 (0.58–0.81)	0.51 (0.35–0.67)
Identification	0.78 (0.68–0.88)	0.59 (0.45–0.74)
One card learning	0.64 (0.51–0.76)	0.61 (0.47–0.76)
One card back	0.60 (0.47–0.73)	0.71 (0.58–0.83)
Digit span total	0.58 (0.47–0.70)	0.55 (0.40–0.70)
RAVLT learning	0.68 (0.56–0.80)	0.61 (0.46–0.76)
RAVLT delayed recall	0.62 (0.49–0.74)	0.62 (0.48–0.76)
King-Devick speed	0.69 (0.58–0.81)	0.63 (0.48–0.77)
Symptom report
RPQ symptom severity	0.85 (0.78–0.93)	0.94 (0.88–0.96)
RPQ symptom frequency	0.83 (0.75–0.92)	0.94 (0.87–0.99)

Abbreviations: AUC = area under the receiver operating characteristic; RAVLT = Rey Adult Verbal Learning Test; RPQ = Rivermead Post Concussion Symptom Questionnaire.

Data presented as AUC (95% CI).