Table 3. Risk of Atrial Fibrillation among those with Orthostatic Hypotension as compared to those without by several sub-groups.

Strata	Number (%of sample)	HR	95% CI	p value
Overall	12071 (100%)	1.4	(1.15,1.71)	–
Age<55 years	6384 (52.9)	1.44	(0.93,2.25)	0.74
Age ≥55 years	5687 (47.1)	1.51	(1.21,1.87)
Female	6647(55.1)	1.66	(1.27,2.18)	0.07
Male	5425 (44.9)	1.20	(0.89,1.16)
African American	3056 (25.3)	1.82	(1.20,2.70)	0.18
Caucasian	9015 (74.7)	1.32	(1.05,1.65)
Prevalent CHD	564 (4.7)	1.35	(0.74,2.49)	0.47
No CHD	11507 (95.3)	1.41	(1.15,1.75)
Diabetes	1116 (9.2)	1.34	(0.82,2.18)	0.29
No Diabetes	10955 (90.8)	1.43	(1.15,1.78)
Hypertension	4064 (33.7)	1.44	(1.12,1.85)	0.71
No hypertension	8007 (6.3)	1.33	(0.96,1.85)
Medication intake	4098 (34.0)	1.66	(1.26,2.19)	0.03
No medications intake	7973 (66.1)	1.08	(0.76,1.54)

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.