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. 2010 Jul 12;5(7):e11551. doi: 10.1371/journal.pone.0011551

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This is an open-access article distributed under the terms of the Creative Commons Public Domain declaration which stipulates that, once placed in the public domain, this work may be freely reproduced, distributed, transmitted, modified, built upon, or otherwise used by anyone for any lawful purpose.

This is an open-access article distributed under the terms of the Creative Commons Public Domain declaration, which stipulates that, once placed in the public domain, this work may be freely reproduced, distributed, transmitted, modified, built upon, or otherwise used by anyone for any lawful purpose.

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¹Thin bars indicate 95% confidence intervals. Within each SES indicator, both the trend test and χ² tests were significant at p<0.0001. ²MHI refers to median household income.