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Table 4 Berg Prediction Rule Based on Signs and Symptoms of ABRS [24]

From: Canadian clinical practice guidelines for acute and chronic rhinosinusitis

Sign or Symptom

Positive Predictive Value (PPV), %

Purulent rhinorrhea with unilateral predominance

50

Local pain with unilateral predominance

41

Pus in nasal cavity

17

Bilateral purulent rhinorrhea

15

  1. Presence of ≥3 symptoms has a positive likelihood ratio (LR) of 6.75.