Change in renal function after sodium phosphate preparation for screening colonoscopy

Table 2 Comparison of the creatinine level and glomerular filtration rate (GFR) among NaP, PEG and control groups (mean  ±  SD)

Evaluation time	Creatinine level (mg/dL)				GFR (mL/min per 1.73 m2)
	NaP group	PEG group	Control group	P	NaP group	PEG group	Control group	P
Baseline	1.12 ± 0.15	1.12 ± 0.16	1.12 ± 0.15	0.985	69.03 ± 7.74	68.91 ± 7.95	69.57 ± 6.67	0.467
Follow-up 12–24 mo later	1.15 ± 0.15	1.15 ± 0.18	1.15 ± 0.15	0.928	66.46 ± 7.78	66.47 ± 8.26	67.42 ± 6.39	0.118