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Table 3 ROC analysis results.

From: Diagnosing norovirus-associated infectious intestinal disease using viral load

Reference groups used Optimal Ct cut-off Youden Index Sensitivity
(95% CI) 		Specificity
(95% CI) 		AUC Sample size
       Reference positive Reference negative
Ref positive 1
Ref negative 1 		       
All 31 0.77 0.88
(0.65–1.00) 		0.89
(0.84–0.94) 		0.93 92 159
aged <5 years 30 0.80 0.94
(0.84–1.00) 		0.86
(0.79–0.93) 		0.93 48 92
aged >5 years 33 0.83 0.89
(0.79–0.98) 		0.94
(0.88–1.00) 		0.96 44 67
Ref positive 2        
Ref negative 1        
  31 0.61 0.72
(0.66–0.79) 		0.89
(0.84–0.94) 		0.87 169 159
Ref positive 3        
Ref negative 2        
  31 0.29 0.43
(0.39–0.47) 		0.86
(0.77–0.94) 		0.64 524 64
  1. The reference groups are described in Table 1. AUC is the area under the curve.
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