A randomized comparative experiment was conducted to investigate the effect of calcium on blood pressure in African-American men. A treatment group of 10 men received a calcium supplement for 12 weeks, and a control group of 11 men received a ``placebo'' during the same period. All subjects had their blood pressure tested before and after the 12-week period.
- Treatment: Whether subject received calcium or placebo
- Begin: seated systolic blood pressure before treatment
- End: seated systolic blood pressure after treatement
- Decrease: Decrease in blood pressure (Begin - End)
Moore, David S., and George P. McCabe (1989). Introduction to the Practice of Statistics.
Lyle, Roseann M., et al., ``Blood pressure and metabolic effects of calcium supplementation in normotensive white and black men,'' JAMA, 257(1987), pp. 1772-1776.
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