Clinical characteristics of the study population.

AUC – area under the curve; BMI – body mass index; C-Pep – C-peptide; Glc – glucose; HDL – high-density lipoprotein; HOMA-IR – homeostasis model assessment of insulin resistance; IFG – impaired fasting glycaemia; IGT – impaired glucose tolerance; IL – interleukin; Ins – insulin; ISI – insulin sensitivity index; LDL – low-density lipoprotein; NGT – normal glucose tolerance; OGTT – oral glucose tolerance test; TNF – tumour necrosis factor; *available from 1,331 subjects of the overall population and from 446 subjects of the TNF-α/IL-6 subgroup; **available from 1,687 subjects of the overall population and from 493 subjects of the TNF-α/IL-6 subgroup.