Table 3.
Prevalence of urinary metabolic abnormalities for each sex by age group

	Total (n=1426)			Male (n=903)			Female (n=523)
	≤60 years	>60 years	p	≤60 years	>60 years	p	≤60 years	>60 years	p
	Low urine volume (%)	42.5	45.5	0.262	40.5	48.4	0.232	38.6	47.6	0.116
Hypercalciuria (%)	27.2	16.0	0.054	21.0	14.5	0.257	23.0	16.8	0.226
Hyperuricosuria (%)	23.1	11.0	<0.001	27.9	17.7	0.103	13.4	6.9	0.089
Hyperoxaluria (%)	11.9	4.9	0.007	12.5	1.7	0.006	10.8	6.9	0.273
Hypocitraturia (%)	44.2	44.2	1.000	47.0	38.7	0.236	38.6	47.6	0.049

Low urine volume: urine volume less than 2000 mL/day; hypercalciuria: calcium excretion greater than 300 mg/day in men and 250 mg/day in women; hyperoxaluria: oxalate excretion greater than 45 mg/day; hyperuricosuria: uric acid excretion greater than 800 mg/day in men and 750 mg/day in women; and hypocitraturia: citrate excretion less than 320 mg/day.