Table 1. Summary statistics for demographics of the cohorts in this study.

N: Normal; Y: Young; O: Old.

	Cohorts
Variable	All	N	Y	O
Total	385,918	363,235	10,817	11,866
Chronological Age
25% quartile	35.9	36.4	60.0	24.3
median	52.4	52.5	69.0	29.9
75% quartile	66.3	66.2	78.2	37.5
Error (chronological - predicted age)
25% quartile	−5.7	−5.2	21.9	−29.2
median	0.0	0.1	24.5	−24.7
75% quartile	5.8	5.4	29.1	−22.0
Gender
Male	40.4%	40.0%	39.6%	53.1%
Female	59.6%	60.0%	60.4%	46.9%
Race
Caucasian (White)	41.0%	40.9%	48.2%	38.5%
African American (Black)	16.9%	17.0%	13.7%	17.2%
Asian	3.9%	3.9%	3.1%	3.9%
Other	19.2%	19.4%	15.0%	19.1%
Hispanic/Latino	5.4%	5.4%	4.7%	6.3%
Native American	0.2%	0.2%	0.3%	0.2%
Pacific Islander	0.1%	0.1%	0.1%	0.1%