including cholesterol, glucose and insulin. The results clearly showed for all traits that MZ correlations (green bars) are higher than DZ correlations (blue bars), showing that genetic factors play a substantial role in nearly all these traits. Analyses of the data showed that for almost all phenotypes, the DZss correlations were equal to the DZos correlations. The DZ twin correlations from the most parsimonious model which constrained DZss and DZos correlations to be similar are also provided in figures 1, 2, 3, 4, 5 (orange bars).
