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

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

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
  1. 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.