Table 1.

Comparison of patient demographics and clinical aspects among three groups.

Group	Group A	Group B	Group C	P-value
Mean age (years)	42.85 ± 11.75	41.81 ± 10.89	38.51 ± 11.11	0.096
Female/male	25/35	27/33	24/36	0.853
Courses of disease (years)	3.90 ± 3.27	4.15 ± 2.46	4.91 ± 2.90	0.138
Hemorrhoids grades (III/IV)	51/9	53/7	50/10	0.730
The number of incisions	2.96 ± 0.90	3.00 ± 0.73	2.98 ± 0.92	0.976
The volume of methylene blue injected(ml)	4.60 ± 1.01	5.43 ± 7.93	/	0.145

Mean age, courses of disease, the number of incisions, and the volume of methylene blue injected are presented as the mean ± standard deviation.