Method: Calcium oxalate crystallization index were determined in the group of urine of the patients in BPH with urinary retention, BPH without urinary retention and the control respectively.

• 方法：分别测定BPH伴急慢性尿潴留（尿潴留组）、BPH不伴尿潴留（无尿潴留组）以及无BPH（对照组）的老年男性尿中草酸钙结晶形成指数。