Flow chart genome-wide association meta-analysis of MZ twin differences in the present study. The eligibility criteria and developmental categories are described in the Methods . If multiple data points were available during the same developmental stage (for example, ages 7, 8 and 11 years), the largest sample was selected. Total n values per phenotype (representing the total across participating studies) were as follows: 13,738 (ADHD largest), 13,738 (ADHD child), 7,840 (ADHD adolescent), 12,354 (anxiety largest), 10,494 (anxiety child), 7,932 (anxiety adult), 14,152 (autistic traits largest), 13,130 (autistic traits child), 6,050 (autistic traits adult), 21,792 (depression largest), 10,510 (depression child), 18,074 (depression adult), 8,900 (neuroticism largest), 3,636 (psychotic-like experiences largest) and 13,740 (wellbeing largest). n values for GWAS analyses were halved as only data from one twin from each pair were included.
