Buffy coat specimens remain viable as a DNA source for highly multiplexed genome-wide genetic tests after long term storage

Table 1 Clinical characteristics of the stored buffy coat samples selected for DNA isolation, N = 120 total samples

Buffy Coat Sample Characteristic	N (% or Std Err)
Gender:
Male	78 (65%)
Female	42 (35%)
Race:
White	77 (64.2%)
African-American	23 (19.2%)
Hispanic	7 (5.8%)
Asian	5 (4.2%)
Other	8 (6.7%)
Age at Draw:
Mean years (Std Err)	63.5 (0.66)
Range years	43-80
Year Drawn:
2001	24 (20%)
2003	24 (20%)
2004	24 (20%)
2005	24 (20%)
2006	11 (9.2%)
2007	10 (8.3%)
2008	3 (2.5%)
Recruiting Clinical Center Network (CCN):
Total CCNs Sampled	7
Mean Samples per CCN (Range)	17.1 (9-20)
Recruiting Clinic:
Total Clinics Sampled	74
Mean Samples per Clinic (Range)	1.62 (1-3)
Laboratory Receipt Time:
Mean hours (Std Err)	29.3 (1.52)
Range hours	12-144

Percentage sums may differ from 100% due to rounding. The Laboratory Receipt Time is the time in hours from blood collection to receipt in the Central Laboratory. The value in the parentheses after the count value in the column labeled N is the percentage or standard error except where noted as a range.

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