Predictive value of symptom characteristics obtained from history
| No with positive history | No correctly identified | Positive predictive value (%) | |
|---|---|---|---|
| PNDS = postnasal drip syndrome; GORD = gastro-oesophageal reflux disease. | |||
| Reproduced from McGarvey et al11 with permission. | |||
| Asthma (nocturnal cough, precipitated by cold air, exercise, aerosols) | 27 | 15 | 56 |
| PNDS (throat clearing, sensation of postnasal drip, nasal discharge, previous sinusitis) | 27 | 14 | 52 |
| GORD (dyspepsia, cough worse after meals) | 20 | 8 | 40 |