This is an important study evaluating the associative factors and natural history of atrial fibrillation. Until age 90, men are at higher risk of developing A.Fib compared to women. Tall women, and overweight and dyslipidemic men are more likely to experience it than their counterparts. Lifetime risk for Atrial fibrillation high, more than 30%. It increases the mortality rate by 3.5 fold in both genders. Subjects were followed for about 13 years.