Table 2.

Baseline characteristics for the 52 men and women over age 55 years randomized to placebo (n=18), potassium citrate 60 mmol/day (n=17), or potassium citrate 90 mmol/day (n=17).

	Placebo (n=18)	Potassium Citrate 60 mmol/day (n=17)	Potassium Citrate 90 mmol/day (n=17)
Age (years)	65.2 ± 6.2	64.7 ± 5.9	63.8 ± 6.4
Gender (% female)	67%	67%	73%
Race (% Caucasian)	83%	100%	78%
BMI (g/m2)	26.0 ± 4.0	25.1 ± 2.7	24.3 ± 3.3
Urine calcium (mg/day)	184 ± 59	206 ± 94	189 ± 82
25 hydroxyvitamin D (nmol/L)	87.5 ± 25.2	78.9 ± 26.3	80.0 ± 26.8
Weight (kg)	68.9 ± 12.9	69.4 ± 13.6	67.6 ± 11.7
Self selected pre-study total calcium intake (mg/day)	1473 ± 704	1415 ± 614	1486 ± 656
Using calcium supplements prior to enrollment (%)	77%	60%	73%

Values are mean ± SD or percent. Baseline values were not significantly different among treatment groups. BMI=body mass index.