2.5 Data analyses and study hypotheses
Using estimates from our prior work (standard deviation = 6.3) [Distributions of outcomes were assessed for approximate normality. Demographic characteristics were compared between Groups using independent t-tests and chi-square tests or their nonparametric equivalents as appropriate. Despite some directional hypotheses, all analyses specified significance level alpha = 0.05 two-tailed. Race was collapsed into 3 categories for inclusion in models as a covariate: white, non-white, and other/multiple/no answer. Sex was denoted as female or not female in models.