MPO and chronic rhinosinusitis without nasal polyps: The results regarding the ratio of ECP to MPO were as follows: 30% of all CRSsNP patients showed ratios ≤0.1, 42% showed ratios >0.1 and ≤0.5, 14% showed ratios >0.5 and ≤1, and 14% showed ratios >1 (Figure 1(a)).