Table 1. Clinical characteristics of the study subjects.

Characters	Patient(n = 200)	Control(n = 200)	p-value
Age (years)	39.93±11.37	38.13±10.16	0.1249
Gender
Male	133 (66.5%)	122 (61.0%)
Female	67 (33.5%)	78 (39.0%)	0.298
BMI (kg/m2)	22.11±1.19	22.20±1.34	Ns
Serum creatinine (mg/dl)	1.21±0.477	0.714±0.096	<0.001
Serum calcium (mg/dl)	9.42±0.32	9.46±0.238	Ns
Urinary calcium excretion (mmol/24 h)	7.87±0.59	4.04±0.68	<0.001
Urinary Oxalate (mg/24 h)	28.11±3.07	27.51±3.11	Ns
Urinary Citrate (mmol/24 h)	2.58±0.96	2.77±1.21	Ns
Urinary potassium (mmol/24 h)	64.21±4.77	64.59±4.61	Ns
Urinary Phosphate (mmol/24 h)	27.45±4.29	26.81±3.33	Ns
Urinary Urate (mmol/24 h)	2.89±0.47	2.78±0.86	Ns
Spot urine pH	5.72±0.31	5.79±0.55	Ns

Values given are averages ± SD.