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Table 2 Differences in autistic and ADHD traits between index twins with either a female or a male co-twin

From: Effect of co-twin gender on neurodevelopmental symptoms: a twin register study

   Female co-twin Male co-twin    
  Index twin N Mean rank N Mean rank Mann–Whitney U P r
ADHD traits Female 1793 3063 4195 2961 3,626,673 0.03 0.03
Male 4190 3179 2109 3091 4,295,000 0.06 0.02
Autistic traits Female 1795 3099 4197 2953 3,582,249 0.001 0.04
Male 4197 3160 2115 3150 4,425,446 0.8
  1. ADHD and autistic traits measured by the Autism—Tics, AD/HD, and other Comorbidities inventory (A-TAC). r effect size