Characteristics of the study population.

<p>Data are expressed as median and 25% and 75% quartiles. HbA1c, glycated hemoglobin; HOMA B, beta-cell function as measured by homeostatic model assessment <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0051132#pone.0051132-Matthews1" target="_blank">[34]</a>. P-values refer to parametric analysis of variance. (a) data are tested by Chi-square test.</p>*<p>denotes significant different (P<0.05) from individuals with normal glucose tolerance, corrected with Dunnett's test.