Table 2. Levels of preoperative nasal nitric oxide in every group.

	Lesion side	Non-lesion side	P value
Fungus	151.3 ± 18.1	228.5 ± 26.9	0.013*
Mass	365.3 ± 35.5	410.0 ± 43.2	0.270
CRSsNP	400.5 ± 59.4	394.5 ± 58.2	0.893
CRSwNP	404.4 ± 45.2	446.2 ± 54.3	0.530

CRSsNP, chronic rhinosinusitis without nasal polyps; CRSwNP, chronic rhinosinusitis with nasal polyps.

*P level was statistically significant by Wilcoxon signed-rank test.