Figures 1, 2, 3, 4, 5 summarize the resemblances for MZ and DZ twin pairs across 5 major domains; Lifestyle, including smoking behavior, use of soft drugs, alcohol use and abuse, and exercise and sports behavior (Figure 1A en 1B); Emotional and Behavioral Problems, including psychiatric measures (e.g. depression, borderline, phobia, ADHD) in adults (Figure 2A), personality (e.g. neuroticism, extraversion, sensation seeking) in adults (Figure 2B), internalizing problems in children (Figure 2C), externalizing problems in children (Figure 2D) and ADHD in children (Figure 2E); Brain function and Cognition including data on EEG (Electroencephalography) power, and cognition assessed with age-appropriate psychometric IQ tests at 5, through 18 years, and educational attainment (Figure 3); Growth and BMI including information on Body Mass Index and height across ages (Figure 4A and 4B). Figure 5 summarizes the results for Metabolic risk factors and Migraine, 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
