Serum leptin levels between participants with and without insulin resistance across different categories of adiposity in men and women, after adjustment for age, total energy intake (quintile), physical activity (quintile) and smoking status (yes/no).

<p>(Data are geometric means and SEM; Insulin resistance was defined as HOMA-IR >1.67 in men and >1.88 in women; P<0.001 between IR - and IR+groups at the same categories in men and women except P = 0.052 between two groups in obese women).</p>