![](img026.GIF) |
The categorical example shown
above suggests that there is a statistically significant difference for changes in resting
systolic blood pressure when outcomes were partitioned according to the country in which
the study was conducted. However, there was no statistically significant difference
between types of trials (See Kelley GA, Kelley KS. Aerobic exercise and resting blood
pressure in women: a meta-analytic review of controlled clinical trials. Journal of
Women's Health & Gender-Based Medicine 8:787-803, 1999). |