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

Table 3 Combined linear regression and analysis of variance results for predictor variables of the total DNA yield (ug)

Predictor	Number of Observations	Effect Size (Std Err)	t-test p-value	anova df	anova p-value
Race (AfrAm)	22			2	0.16
White	75	-7.4 ug (15.8)	0.21
Other	20	25.7 ug (20.6)	0.64
Year	117	-11.6 ug (4.2)	0.0061	1	0.0061
CCN	117			6	0.28
Gender (Female)	42				0.30
Male	75	13.8 ug (13.1)	0.30	1
Age	117	-2.1 ug/year (0.84)	0.015	1	0.015
Lab Receipt Time	117	-0.7 ug/hour (0.5)	0.16	1	0.16

The table contains the marginal univariate t-test results are shown for all predictor variables with 1 or 2 degrees of freedom (df). The marginal tests describe the effect of the predictor variable after adjusting for all other variables in the model. The individual t-test results for each CCN are not shown. The anova and t-test p-values are necessarily identical for 1 degree of freedom predictors. The reference category for the categorical predictor variables (Race and Gender) are shown in parentheses beside the variable name.

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