Table 2

Predictive value of symptom characteristics obtained from history

No. with positive historyNo. correctly identifiedPositive
predictive value (%)
Asthma (nocturnal cough, precipitated by cold air, exercise, aerosols)271556
PNDS (throat clearing, sensation of post nasal drip, nasal discharge, previous sinusitis)271452
GOR (dyspepsia, cough worse after meals)20 840
  • PNDS = post-nasal drip syndrome; GOR = gastro-oesophageal reflux.