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. 2012 Jul 27;7(7):e41964. doi: 10.1371/journal.pone.0041964

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© 2012 Kim 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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Boxes and horizontal lines within boxes represent interquartile ranges (IQRs) and median values, respectively. The upper and lower whiskers indicate 75^th percentile plus 1.5 IQR and 25^th percentile minus 1.5 IQR, respectively. o, mild outlier: a value more than 75^th percentile plus 1.5 IQR, but less than 75^th percentile plus 3.0 IQR.