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Table 5 Williams Prediction Rule Based on Signs and Symptoms of ABRS [25]

From: Canadian clinical practice guidelines for acute and chronic rhinosinusitis

Sign or Symptom Likelihood Ratio (LR) (present)
Maxillary toothache 2.5
Poor response to antihistamines/decongestants 2.1
Purulent nasal secretions 2.1
Abnormal transillumination 1.6
Colored nasal discharge 1.5
  1. Presence of ≥4 symptoms has a positive LR of 6.4.