Urinary and sexual function changes in benign prostatic hyperplasia patients before and after transurethral columnar balloon dilatation of the prostate

Table 4 Pre- and postoperative serum prostate-specific antigen levels between groups (mean ± SD, μg/L)

Group	n	Before therapy	Treatment for 1 mo	Treatment for 3 mo
Study group	70	7.52 ± 2.01	4.37 ± 1.49a	3.56 ± 1.33a
Control group	70	7.90 ± 2.46	4.60 ± 1.55a	3.82 ± 1.50a
t value		-1.001	-0.895	-1.085
P value		0.319	0.372	0.280

^aP < 0.05 vs data before treatment in the same group.