TABLE 2—

Principal Component (PC) Loadings Showing the Correlations Between the PC Scores and the 12 County-Level Social and Economic Variables and Percentage of the Variance Explained and Eigenvalues for Each PC: Kentucky 2017–2018 Outbreak

	PC1	PC2	PC3
Eigenvalues	5.30	2.85	0.89
Proportion of variability explained	0.442	0.237	0.074
Cumulative proportion of variability explained	0.442	0.679	0.753
% of all people with income below poverty level	0.921	0.263	0.103
% educational attainment in population aged ≥ 25 y < ninth grade	0.791	0.480	−0.039
% civilian noninstitutionalized population with a disability	0.729	0.510	0.025
% of families that are single-female head of household	0.721	−0.471	−0.076
County-level Gini index of income inequality	0.658	0.066	0.249
% of grandparents responsible for grandchildren	0.537	0.120	0.465
% of families that are single-male head of household	0.487	−0.346	−0.513
% with different residence 1 y ago	−0.122	−0.724	0.476
% of women who are now married, except separated	−0.520	0.706	0.022
% of men who are now married, except separated	−0.552	0.601	−0.177
% of families that are married householders	−0.774	0.517	0.265
% high-school graduate or higher	−0.792	−0.526	0.017