Blood pressure

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.

Variables.

1. Treatment: Whether subject received calcium or placebo
2. Begin: seated systolic blood pressure before treatment
3. End: seated systolic blood pressure after treatement
4. Decrease: Decrease in blood pressure (Begin - End)

Reference.

Moore, David S., and George P. McCabe (1989). Introduction to the Practice of Statistics.

Source.

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.