Table 2.

Adjusted urine electrolytes during the control and alkali periods by CKD status.

Urine diet biomarker	Non-CKD (n=6)		CKD (n=8)
	Control period	Alkali period	Control period	Alkali period
Urea nitrogen, g/d	9.3 ± 2.0	9.5 ± 1.9	8.5 ± 1.6	8.3 ± 1.8
Potassium, mmol/d	63.0 ± 12.0	59.0 ± 12.9	52.7 ± 7.1	52.5 ± 4.2
Sodium, mmol/d	105.3 ± 21.1	94.0 ± 32.8	107.7 ± 21.1	101.1 ± 10.5
Magnesium, mg/d	84.2 ± 15.5	81.5 ± 15.3	63.3 ± 22.3	61.8 ± 22.1
Calcium, mmol/d	149.7 ± 65.9a	143.6 ± 80.7b	53.5 ± 40.7a	48.9 ± 38.9b
Sulfate, mmol/d	34.1 ± 10.6	34.3 ± 10.5	30.0 ± 10.1	30.0 ± 9.3
Phosphorus, g/d	0.6 ± 0.2	0.6 ± 0.2	0.5 ± 0.1	0.5 ± 0.1

Data expressed as means ± standard deviations. All participants completed two consecutive 24-hour urine collections at the end of the alkali and control periods except one participant in the non-CKD group who completed one 24-hour urine collection at the end of the control period. Urine electrolytes are calibrated by regression to a constant mean urine creatinine concentration in each individual over the study period. P-values for between group difference during the control and alkali periods were

^a<0.01 and

^b0.01, respectively.