Table 1. Baseline Characteristics of Individuals Having Affected First-Degree Relatives With AF and in the General Population.

Variable	First-Degree Relative With AF	General Population
No.	300 239	23 422 955
Male, No. (%)	176 151 (58.7)	11 519 413 (49.2)
Age, mean (SD), y	43.7 (14.9)	39.0 (20.9)
AF, No. (%)	3509 (1.2)	177 770 (0.8)

Abbreviation: AF, atrial fibrillation.