Table 2.

Potassium values

	Mean ± SD (mmol/l)			> 5 to ≤5.5 mmol/l (%)		> 5.5 mmol/l (%)*
	Certo	Plac	p-value**	Certo	Plac	Certo	Plac
Baseline	4.2 ± 0.4	4.2 ± 0.4	p = n.s.	3.5	0	0	0
Discharge	4.2 ± 0.4	4.2 ± 0.4	p = n.s.	3.9	4	0	0
2 weeks	4.5 ± 0.4	4.5 ± 0.4	p = n.s.	8.3	6	0	2
4-6 weeks	4.4 ± 0.4	4.4 ± 0.4	p = n.s.	8.9	4.3	0	2.2
3 months	4.4 ± 0.3	4.5 ± 0.3	p = n.s.	4.8	4.4	0	0
6 months	4.3 ± 0.3	4.3 ± 0.4	p = n.s.	4.9	2.4	0	0

Legend: *there were no patients with a serum potassium > 6.0 mmol/l; **the statistical evaluation was performed using paired, two sided t-test for each of the treatment groups to compare baseline and follow-up values.