Table 2.

Characteristics of each stone episode

	No surgery	Surgery	P-value
N (%)	57 (40)	76 (57)
Urine pH (avg)	7.0 (6.7, 7.3)	6.6 (6.5, 6.9)	0.99
High creatinine	4 (3)	6 (5)	0.97
Hypercalciuria	29 (20)	32 (24)	0.46
Hypocitraturia	14 (11)	21 (16)	0.84
Hypercalcemia	8 (6)	3 (2)	0.26
History of UTI’s	48 (34)	61(46)	0.51
Hematuria	11 (8)	33 (25)	0.06
Flank pain	37 (26)	49 (37)	0.62
UTI	14 (10)	13 (10)	0.91
Incidental	7 (5)	11(8)	0.75
Bilateral Stones	5 (14 %)	6 (13 %)	0.85
# of stones (SD)	1.6 (1.0)	1.8 (1.1)	0.43
Stone size at dx (mm) (SD)	4.8 (2.6)	6.7 (4.3)	0.008*

*represents a p value < 0.05