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. Author manuscript; available in PMC: 2014 Sep 10.
Published in final edited form as: Lancet. 2013 Sep 29;383(9921):999–1008. doi: 10.1016/S0140-6736(13)61752-3

Table 1. Population cohorts for the heart study.

Cohort First Year Size % Female Salient Features
Original 1948 5209 55%
Offspring 1971 5124 52% Children of the Original Cohort, and their spouses
Third Generation 2002 4095 53% Children of the Offspring Cohort
New Offspring Spouse 2003 103 54% Spouses of Offspring Cohort who were not initially enrolled in FHS, and whose 2 children are in Third Generation Cohort. Added to improve statistical power
Omni 1 1994 506 58% To reflect the increasing ethnical diversity of the community. African-American, Hispanic, Asian, Indian, Pacific Islander and Native American
Omni 2 2003 410 57% Recruited in order to achieve 10% of Third Generation Cohort size