Correlation between bioactive and immunoreactive leptin levels with selected indices of insulin secretion and insulin resistance.

<p>A—fasting serum insulin (logINS₀); B–HOMA-IR; C–QUICKI; D–free fatty acids insulin sensitivity index (ISI-FFA); E–C-peptide and fasting glucose ratio (CP₀/GLU₀); F– 120-minute values of insulin during a 75g oral glucose-tolerance test (INS₁₂₀); G–peak insulin levels during a 75g oral glucose-tolerance test (INS_MAX); H–oral disposition index (oDI); I–ratio of areas under the curve for insulin and glucose levels during a 75g oral glucose-tolerance test (AUC_INS/AUC_GLU); J–whole body insulin sensitivity index (WBISI Matsuda). Empty black icons symbolize bioactive leptin, and empty grey icons immunoreactive leptin levels, respectively. In the figure log values of all variables were used.