- Datafile Name:
Calcium
Datafile Subjects: Health
, Medical
Story Names: Calcium
and Blood Pressure
Reference: Moore, David S., and George P. McCabe (1989). Introduction
to the Practice of Statistics. Original 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,
Authorization: contact authors
Description: Results of a randomized comparative experiment 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.
Number of cases: 21
Variable Names:
- 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)
The Data: Treatment Begin End Decrease
Calcium 107 100 7
Calcium 110 114 -4
Calcium 123 105 18
Calcium 129 112 17
Calcium 112 115 -3
Calcium 111 116 -5
Calcium 107 106 1
Calcium 112 102 10
Calcium 136 125 11
Calcium 102 104 -2
Placebo 123 124 -1
Placebo 109 97 12
Placebo 112 113 -1
Placebo 102 105 -3
Placebo 98 95 3
Placebo 114 119 -5
Placebo 119 114 5
Placebo 112 114 2
Placebo 110 121 -11
Placebo 117 118 -1
Placebo 130 133 -3