Table 3.

Multivariate regression analysis with group, sex, and age as covariates (independent variables) and principal components 1–6 (PC1–PC6) as dependent variables.

	Regression coefficients* for…
	Group	Sex	Age
PC1	4.023	−18.996	1
PC2	8.244	−7.942	−0.535
PC3	−10.188	−12.439	0.923
PC4	6.597	−1.028	0.314
PC5	6.017	−4.387	−0.195
PC6	−2.575	7.754	0.496

Total SS: 0.34713215; predicted SS: 0.04025944; residual SS: 0.3068727 (SS = sums of squares); % of predicted variability: 11.60%; P‐value: <0.00001 (100 000 permutation runs).

^*Regression coefficients were multiplied by 1000.