Table 3 Area under the Receiver Operating Characteristic curve (95% CI) of symptoms, signs and context, single or in combination, for the diagnosis of influenza.
Symptoms. signs and context | Single | Combinations | |||||
|---|---|---|---|---|---|---|---|
Influenza epidemic | 0.67 (0.65 to 0.68) | Influenza epidemic + | Influenza epidemic + | Influenza epidemic + | Influenza epidemic + | Influenza epidemic + | Influenza epidemic + |
ILI contacts | 0.56 (0.55 to 0.58) | 0.68 (0.67 to 0.70) | ILI contactsa + | ILI contacts + | ILI contacts + | 0.72 (0.71-0.74) | 0.74 (0.72-0.75) |
Cough | 0.60 (0.59 to 0.61) | 0.71 (0.70 to 0.72) | 0.72 (0.71 to 0.74) | Cough + | Cough + | Cough+ | Cough+ |
Temp > 37.8°C | 0.54 (0.53 to 0.55) | 0.69 (0.68 to 0.70) | 0.71 (0.69 to 0.72) | 0.74 (0.72 to 0.75) | Temp > 37.8°C + | 0.75 (0.73-0.76) | Temp+ |
Expectoration*illness dayb | 0.56 (0.55 to 0.58) | 0.70 (0.68 to 0.71) | 0.70 (0.69 to 0.72) | 0.73 (0.72 to 0.75) | 0.75 (0.73 to 0.76) | 0.72 (0.71 to 0.74) | 0.75 (0.73 to 0.76) |
Lack of appetite | 0.54 (0.53 to 0.56) | 0.69 (0.67 to 0.70) | 0.70 (0.68 to 0.71) | 0.73 (0.72 to 0.74) | 0.74 (0.73 to 0.76) | 0.72 (0.71 to 0.74) | 0.75 (0.73 to 0.76) |
Nose symptoms | 0.56 (0.54 to 0.57) | 0.69 (0.68 to 0.71) | 0.70 (0.69 to 0.72) | 0.73 (0.71 to 0.74) | 0.74 (0.73 to 0.76) | 0.70 (0.69 to 0.72) | 0.75 (0.74 to 0.76) |
Expectoration | 0.53 (0.52 to 0.54) | 0.68 (0.67 to 0.69) | 0.69 (0.68 to 0.71) | 0.72 (0.71 to 0.74) | 0.74 (0.72 to 0.75) | 0.71 (0.70 to 0.73) | 0.75 (0.73 to 0.76) |
Muscle pain | 0.52 (0.51 to 0.53) | 0.68 (0.66 to 0.69) | 0.69 (0.68 to 0.71) | 0.73 (0.71 to 0.74) | 0.74 (0.73 to 0.76) | 0.72 (0.70 to 0.73) | 0.75 (0.73 to 0.76) |
Flu 'vaccine | 0.52 (0.51 to 0.53) | 0.67 (0.66 to 0.69) | 0.69 (0.67 to 0.70) | 0.73 (0.71 to 0.74) | 0.74 (0.72 to 0.75) | 0.72 (0.70 to 0.73) | 0.75 (0.73 to 0.76) |
Vertigo | 0.51 (0.50 to 0.52) | 0.67 (0.66 to 0.68) | 0.69 (0.67 to 0.70) | 0.73 (0.71 to 0.74) | 0.74 (0.73 to 0.75) | 0.71 (0.70 to 0.73) | 0.75 (0.73 to 0.76) |