Correlation analysis between adipokine levels and insulin sensitivity in nonpregnant and pregnant rats at d 18 and 20 of gestation. A, Correlation between concentrations of circulating PAI-1 (active) and QUICKI or FGIR. B, Correlation between concentrations of TNF-α in lumbar adipose tissue and QUICKI or FGIR. Circles, Nonpregnant rats; squares, 18-d-pregnant rats; and diamonds, 20-d-pregnant rats.