Fig. 3From: Comparative analysis of chronic rhinitis patient profiles during autumn pollen season between grassland and non-grassland cities in North ChinaComparison of severity of clinical symptoms between AR and NAR populations in Baotou and Beijing. The Mann–Whitney U test was used to analyze the difference in the severity of clinical symptoms between the AR and NAR population in the two regions. AR Allergic rhinitis, NAR nonallergic rhinitis. **P < 0.01, ***P < 0.001Back to article page