Once we determined the items comprising each factor, we obtained composite scores for each factor by summing its respective item scores. With the understanding that these summary scores may obscure the variation of individual items in a given factor, we were interested in the general trends for the purposes of this study. We conducted univariate analyses of variance, using the general linear model, to assess within each group, whether average scores on the factors obtained from the exploratory PCA differentiated willingness to participate in genetic research. Using analyses of covariance, we obtained adjusted mean factor scores after controlling for demographic or other relevant factors, where necessary.
