Risk of Atrial Fibrillation among those with Orthostatic Hypotension as compared to those without by several sub-groups.

Results from the Atherosclerosis Risk in Communities Study: 1987–89 through 2009.
CHD = Coronary Heart Disease, HF = Heart Failure, HR = Hazard Ratio.
p for interaction will be low if the relationship is different in the two strata of variable, and refers to p value for the term Orthostatic Hypotension*Strata variable in a model including both these variables and other potential confounders.
Medications refers to the drugs that have tendency to cause orthostatic hypotension including anti-hypertensive.