Clinical study on the minimally invasive percutaneous nephrolithotomy treatment of upper urinary calculi

Table 2 Comparison of renal function indexes of the two groups of patients before and after treatment

Group	Cr (μmol/L)		BMG (ng/L)		RBP (mg/L)
	Before therapy	After treatment	Before therapy	After treatment	Before therapy	After treatment
PCNL group	124.35 ± 8.11	124.36 ± 7.42	3.16 ± 1.01	3.15 ± 0.22	55.34 ± 5.68	55.38 ± 6.03
mPCNL group	124.33 ± 7.45	124.37 ± 5.88	3.15 ± 0.98	3.17 ± 0.38	55.32 ± 4.97	55.35 ± 7.49
t value	0.011	-0.007	0.045	-0.288	0.017	0.020
P value	0.495	0.497	0.482	0.387	0.493	0.492

mPCNL: Minimally invasive percutaneous nephrolithotomy; Cr: Serum creatinine; BMG: β2 microglobulin; RBP: retinol binding protein.