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. Author manuscript; available in PMC: 2019 Sep 3.
Published in final edited form as: J Occup Environ Hyg. 2019 May 20;16(7):489–497. doi: 10.1080/15459624.2019.1609006

Figure 2.

Figure 2.

NIOSH principal component analysis (PCA) panel. A subject’s cell number is determined by their PC1 and PC2 coordinates on the PCA panel. Cell 1 is considered small face size, Cells 2, 4, 5, and 7 are considered medium face size, cell 8 is considered large face size, Cell 3 is considered short/wide, and Cell 6 is considered long/narrow.