Table 2.
Comparison of 24 hr urinary excretion of metabolites 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
	Sodium (mEq/d)	201.3 ± 82.5	183.8 ± 83.1	0.010	209.5 ± 84.2	197.0 ± 72.4	0.260	185.0 ± 78.8	176.1 ± 88.2	0.322
Calcium (mg/d)	209.4 ± 100.9	166.7 ± 88.0	<0.001	219.1 ± 102.1	172.8 ± 99.8	0.001	189.8 ± 95.7	162.9 ± 80.2	0.009
Uric acid (mg/d)	647.9 ± 218.2	531.6 ± 193.2	<0.001	689.2 ± 222.8	606.5 ± 209.9	0.005	565.1 ± 182.4	486.0 ± 167.6	<0.001
Magnesium (g/d)	0.01 ± 0.05	0.09 ± 0.04	0.122	0.10 ± 0.05	0.10 ± 0.14	0.791	0.09 ± 0.04	0.09 ± 0.04	0.256
Oxalate (mg/d)	26.6 ± 23.8	23.4 ± 16.4	0.092	26.8 ± 21.8	23.07 ± 10.2	0.191	26.3 ± 27.6	23.5 ± 19.1	0.342
Citrate (mg/d)	374.2 ± 217.7	355.1 ± 206.2	0.289	353.7 ± 203.7	379.2 ± 219.5	0.352	415.6 ± 238.5	340.8 ± 197.6	0.004
Urine pH	5.9 ± 0.7	5.6 ± 0.8	0.003	5.9 ± 0.6	5.6 ± 1.0	0.013	5.9 ± 0.7	5.7 ± 0.7	0.047
Volume (mL/d)	1718.4 ± 666.2	1747.4 ± 779.4	0.601	1755.0 ± 656.9	1677.6 ± 752.2	0.371	1643.5 ± 678.9	1790.1 ± 796.0	0.058

Data are presented as the mean ± standard deviation or the number of patients, with the percentage in parentheses.