Table 2.

Prior stone procedures reported by patients at initial clinic presentation compared to age of first reported stone episode.

Prior Reported Stone Surgeries on Initial Presentation
	Initial stone before age 20 (n = 66)	Initial stone after age 20 (n = 406)	p value
No prior stone procedures	36.4%	48.3%	p = 0.084
Ureteral stent placement	16.7%	12.3%	p = 0.325
Nephrostomy tube placement	1.5%	3.0%	p = 1.000
Ureteroscopy	54.5%	35.2%	p = 0.004
Percutaneous Nephrolithotomy	9.1%	7.9%	p = 0.807
Shock Wave Lithotripsy	45.5%	39.7%	p = 0.418
Open or Laparoscopic Stone Surgery	6.1%	2.5%	p = 0.118