TABLE 1.

Information Available in Early U.S. Censuses for the Search of Longevity Predictors

	Early U.S. census
Variables	1860	1870	1880	1900	1910	1920	1930
Age, sex, color/race	+	+	+	+	+	+	+
Month and year of birth				+
Marital status			+	+	+	+	+
Marriage duration (for married)				+	+		+
Literacy	+	+	+	+	+	+	+
School attendance (for children)	+	+	+	+	+	+	+
Place of birth	+	+	+	+	+	+	+
Places of birth for parents			+	+	+	+	+
Parental nativity		+	+	+	+	+	+
Mother tongue						+	+
Home ownership				+	+	+	+
Farm status				+	+		+
Value of real and personal estate	+	+					+
Number of children born and surviving (for women)				+	+
Whether speech or hearing impaired					+
Radio in household							+
Occupation	+	+	+	+	+	+	+
Employment			+	+	+	+	+
Citizenship		+		+	+	+	+
Year of immigration				+	+	+	+
Veteran status					+		+