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
| Â | Â | Female co-twin | Male co-twin | Â | Â | Â | ||
|---|---|---|---|---|---|---|---|---|
|  | 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 | – | |