Sample size
stroke, 3mm/Hg in blood pressure, coronary heart disease
STROKE, EVENTS, CORONARY HEART DISEASE
A total of 307 participants (154 in the control group and 153 in the intervention group) was sufficient to provide 95% power at a significance level of 0.01 to detect a minimum difference of 3mm/Hg in blood pressure, assuming a standard deviation of 6 mm/Hg. The sample size for the current research was based on previous research that showed a decrease in 5 mm/Hg systolic blood pressure was associated with a clinically significant reduction in the relative risk of stroke and coronary heart disease events [