|Test||Number of studies (n)||Positive likelihood ratio||Negative likelihood ratio||Diagnostic odds ratio (CI)†|
|*CI defined in glossary.|
|†Calculated as the odds of the symptom or finding among patients with the disease compared with the odds of the symptom or finding among those not having the disease.|
|Fever (37.8–38.5°C)||3||1.8||0.40||4.5 (1.8 to 11.0)|
|Feverish (patient report)||2||Not reported||Not reported||1.1 (0.88 to 1.4)‡|
|Cough||4||1.1||0.42||2.8 (2.1 to 3.7)|
|Myalgia||3||0.93||1.2||0.79 (0.54 to 1.1)‡|
|Headache||4||1.0||0.75||1.4 (1.2 to 1.8)|
|Sore throat||3||1.0||0.96||1.1 (0.87 to 1.3)‡|
|Sneezing||2||1.2||0.87||1.3 (0.95 to 1.9)‡|
|Nasal congestion||2||1.1||0.49||2.3 (1.9 to 2.8)|
- Assessment (screening or diagnosis)
Review: fever and cough are the most accurate single tests for diagnosing influenza
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