Fig. 1

Multivariate statistical analysis. Score plots for the PCA (a) and PLS-DA (b) models comparing the low- and high-residential radon exposure groups. The validation performance of the PLS-DA model (c).

Multivariate statistical analysis. Score plots for the PCA (a) and PLS-DA (b) models comparing the low- and high-residential radon exposure groups. The validation performance of the PLS-DA model (c).