Figure 4

Frequency of non-asthma, fewer-symptom asthma or multi-symptom asthma in subjects who reported symptoms of chronic rhinosinusitis, including nasal blockage, nasal secretion, aching sinuses or reduced smell, all for at least 12 weeks during the last year. Each individual symptom was a significant risk factor for multi-symptom asthma. *** P < 0.001.