No. with positive history | No. correctly identified | Positive predictive value (%) | |
---|---|---|---|
Asthma (nocturnal cough, precipitated by cold air, exercise, aerosols) | 27 | 15 | 56 |
PNDS (throat clearing, sensation of post nasal drip, nasal discharge, previous sinusitis) | 27 | 14 | 52 |
GOR (dyspepsia, cough worse after meals) | 20 | 8 | 40 |
PNDS = post-nasal drip syndrome; GOR = gastro-oesophageal reflux.