Table 2. Urinary compositions variables in baseline and the long term follow up.

Study	Follow up	Method	Urine volume (L/day)		Sodium (mmol/day)		Calcium (mmol/day)		Oxalate (mmol/day)		Citrate (mmol/day)		Urea (mmol/day)		Sulfate (mmol/day)		Relative oxalate saturation
			Baseline	Result	Baseline	Result	Baseline	Result	Baseline	Result	Baseline	Result	Baseline	Result	Baseline	Result	Baseline	Result
Dussol	3 year	Low protein	1.8±0.6	1.9±0.8	149±44	171±71	6.8±3.1	7.0±3.5	0.30±0.1	0.29±0.1	2.9±1.9	2.9±1.5	381±95	359±135	4.3±1.9	3.1±2.4
		High fiber	2.0±0.7	1.8±0.6	163±58	154±55	6.9±3.7	7.0±3.5	0.31±0.2	0.32±0.1	3.3±3.2	2.1±1.2	354±93	361±117	4.6±2.8	4.8±3.6
Borghi	3 year	Low protein Low salt	1.9±6.7	2.1±5.2	205±64	127±66b	7.0±3.4	6.6±2.4	0.42±0.1	0.33±0.1b			505±142	447±113	2.8±0.8	2.5±0.6	6.7±4.5	4.5±2.9a
Kocvara	3 year	Special diet	2.4±6.5	2.4±6.5			5.1±2.4	6.4±2.8b	0.35±0.2	0.42±0.2a	3.0±1.5	3.2±1.9
Borghi	5 year	Fluid intake	1.1±0.2	2.6±0.7b													1.8±1.7	1.2±1.0b

^a: P<0.05 compared to the baseline;

^b:P<0.01 compared to the baseline