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. 2014 Mar 19;9(3):e91917. doi: 10.1371/journal.pone.0091917

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© 2014 Zou et al

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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(A): Population percentile based on age characteristic in the nine divisions. Age group 15 to 60 have the highest population percentage. (B): Population percentile pertaining to educational attainment characteristic in the nine divisions. Educational attainment more than 12 years have the highest population percentage. (C): Population percentile of race characteristic in the nine divisions, the white have the highest population percentage. (D): Population percentile of income characteristic in the nine divisions. Division 1 is New England; Division 2 is Mid-Atlantic; Division 3 is East North Central; Division 4 is West North Central; Division 5 is South Atlantic; Division 6 is East South Central; Division 7 is West South Central; Division 8 is Mountain; Division 9 is Pacific.