Table 1. Patient characteristics.

Variables		Doxazosin	Placebo	P value
No. of Patients		112	107	NA
Age (y), Mean ± SD (Range)		44.7 ± 9.4 (26-64)	46.6 ±8.2 (30-66)	0.12*
Gender, n (%)				0.46†
	Female	35(31)	28 (26)
	Male	77(69)	79(74)
Laterality, n (%)				0.13†
	Left	53(47)	39(36)
	Right	59(53)	68(64)
Stone size (mm). Mean ±SD		8.2 ± 3.5	7.8 ±2.5	0.27*
Stone location, n (%)				0.56†
	Upper	19(17)	13 (12)
	Middle	20(18)	18(17)
	Lower	73(65)	76(71)
Height (cm). Meant ± SD		164.4 ± 6.5	163.6 ± 6.2	0.31*
Length of stent, n (%)				0.35†
	24 cm	50(45)	55(51)
	26 cm	62(55)	52 (49)

NA not applicants

^*Student t test

^†Chi-square test