Table II.

The pathological types and nature of the surface epithelium in nasal polyps.

	Ulceration			Histological type
Histological type	Non-ulcerated (n=11)	Ulcerated (n=116)	P-value	Pseudostratified ciliated columnar epithelium (n=108)	Squamous epithelium (n=12)	Transitional epithelium (n=7)	P-value	Pseudostratified vs. squamous	Pseudostratified vs. transitional	Squamous vs. transitional
Allergic polyps (n=69)	3 (4.35%)	66 (95.65%)	0.059	58 (84.06%)	8 (11.59%)	3 (4.35%)	<0.001	0.007	0.003	0.042
Fibro-inflammatory polyps (n=47)	0 (0%)	47 (100%)	0.008	43 (91.48%)	2 (4.26%)	2 (4.26%)	<0.001	0.007	0.007	0.539
Hyperplastic polyps (n=11)	8 (72.73%)	3 (26.27%)	<0.001	7 (63.64%)	2 (18.18%)	2 (18.18%)	0.025	0.035	0.035	0.539

The difference in proportions of the epithelium types within each group were examined by the Chi-squared test.