Prospective randomized comparison of oral sodium phosphate and polyethylene glycol lavage for colonoscopy preparation

Table 7 Electrolytes

	NaP (n = 40)			PEG (n = 40)			Overall			2-Sample
	Baseline	Follow-up	Change1	Baseline	Follow-up	Change1	Baseline	Follow-up	Change1	t-test
	Mean±SD2	Mean±SD2	Mean±SD2	Mean±SD2	Mean±SD2	Mean±SD2	Mean±SD2	Mean±SD2	Mean±SD2	P3
Na (meq/L)	138.83±2.15	140.40±2.42	1.58±2.57b	138.85±2.15	140.88±2.37	2.03±1.83b	138.84±2.14	140.64±2.39	1.80±2.23b	0.370
K (meq/L)	3.99±0.34	3.86±0.39	-0.13±0.43	4.02±0.40	4.10±0.50	0.09±0.40	4.00±0.37	3.98±0.46	-0.02±0.43	0.022a
Cl (meq/L)	104.93±2.75	101.48±2.77	-3.45±2.84b	105.20±2.85	101.43±2.38	-3.78±2.71b	105.06±2.78	101.45±2.57	-3.61±2.76b	0.602
Ca (mg/dL)	9.17±0.35	9.17±0.39	-0.01±0.49	9.14±0.36	9.29±0.34	0.15±0.40a	9.16±0.35	9.23±0.37	0.07±0.46	0.129
P (mg/dL)	3.42±0.83	2.71±0.50	-0.71±0.76b	3.25±0.57	3.10±0.51	-0.16±0.57	3.34±0.71	2.90±0.54	-0.43±0.73b	<0.001b

^aP<0.05;

^bP<0.01.

¹Change: value obtained at follow-up visit – value obtained at baseline visit.

²SD: standard deviation. ³The change from baseline (change) was compared between the two groups by independent 2-sample t-test.