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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.