Relationship between waist-to-height ratio (WHtR) and triceps skinfold thickness (SKF) or the ratio of trunk-to-extremity SKF (T/E SKF), in girls (A, C) and boys (B, D). The open symbols represent those self-reporting being in Tanner stages 1–3 for breast development in girls and genital development in boys. The closed symbols represent Tanner stages 4–5. Nonlinear regression lines and correlations for the relationships are indicated by the solid lines. (A) lnWHtR = 4.264 – 0.601 × lnTricepsSKF + 0.144 × lnTricepsSKF2, r2 = 0.538, p < 0.001 (129 girls); (B) lnWHtR = 3.842 – 0.287 × lnTricepsSKF + 0.095 × lnTricepsSKF2, r2 = 0.690, p < 0.001 (95 boys); (C) lnWHtR = 3.738 + 0.294 × lnT/E SKF + 0.298 × lnT/ESKF2, r2 = 0.308, p < 0.001 (129 girls); (D) lnWHtR = 3.746 + 0.247 × lnT/ESKF + 0.308 × lnT/ESKF2, r2 = 0.271, p < 0.001 (95 boys). SKF = skinfold thickness; T/E SKF = the ratio of trunk-to-extremity skinfold thicknesses; WHtR = waist-to-height ratio.