Table 2. Patients demographic data and stone characteristics in percutaneous approach.

Treatment	No. of patients	Age (y, m)			Sex			Side			Stone size (mm)			Stone location
		Min to Max	Mean (y)		M	F		R	L		Min to Max	Mean		Pelvis	Staghorn	Upper calix	Lower calix
PCNL	28	21 m to 18 y	9.2		9	19		16	12		11–35	19		14	11	2	1
Microperc	8	18 m to 17 y	8.7		3	5		4	4		12–20	15		1	–	0	7
Total	36	18 m to 17 y	8.7		12	24		20	16		11–35	18.5		17	11	3	5

y, years; m, months; M, males; F, females; R, right; L, left; PCNL, percutaneous nephrolithotomy; Microperc, micropercutaneous.