Table 5. Sensitivity, specificity and area under curve value of the case definitions tested for detection of influenza, GROG study, France, 2009–2014 .

Case definition	Sensitivity % (95% CI)	Specificity % (95% CI)	AUC % (95% CI)
ECDC ILI	96.1 (95.5–96.6)	6.6 (6.1–7.1)	0.513 (0.504–0.523)
CDC ILI	95.7 (95.2–96.2)	7.3 (6.8–7.9)	0.515 (0.506–0.524)
WHO	89.8 (89.0–90.6)	21.4 (20.6–22.3)	0.556 (0.547–0.566)

AUC: area under curve; CDC: Centers for Disease Control and Prevention; CI: confidence interval; ECDC: European Centre for Disease Prevention and Control; GROG: Groupes Régionaux d’Observation de la Grippe; ILI: influenza-like illness; WHO: World Health Organization.