Sonographic appearance of anal cushions of hemorrhoids

Table 1 General characteristics of the three groups

	Total No.	Gender, male/female	Age (yr)	Duration of symptoms (mo)
Group A (stages III and IV)	38	26/12	42 ± 2.4	7.8 ± 2.4
Group B (stages I and II)	24	14/10	44 ± 2.5	6.6 ± 3.8
Group C (healthy controls)	42	24/18	41 ± 2.2	-
χ2/t-value	1	0.28751	1
	2	0.65502	2
	3	0.02713	3
P value	1	0.59191	1
	2	0.41832	2
	3	0.86923	3

¹Comparison between group A and group B;

²Comparison between group A and group C; ³Comparison between group B and group C.