[DHA/EPA] desaturase indices in males (M) compared to females who are not using HC, F(non), and females who are using HC, F(HC). Differences where determined in Caucasians (A) and East Asians (B). Data presented as mean ± standard error mean. P-values were determined using multiple linear regression models which were adjusted for BMI, age, dietary LA, ALA, EPA and DHA, % total energy from dietary fat and physical activity. Caucasian M: n = 113; Caucasian F(non): n = 161; Caucasian F(HC): n = 137; East Asian M: n = 98; East Asian F(non): n = 234; East Asian F(HC): n = 43.