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Table 1 Distribution of scores (%) for index twins with either a female or male co-twin

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

  ADHD ASD
  FF FM MF MM FF FM MF MM
0 45.1 47.4 34.2 35.5 55.7 60.6 47.7 48.2
0.5 11.3 11.6 10.0 10.0 17.8 16.7 17.2 17.5
1 8.2 8.9 7.6 8.2 11.1 9.3 12.7 11.5
1.5 6.3 6.1 5.9 6.1 4.8 4.6 6.0 6.2
2 4.8 5.4 5.7 4.7 3.4 2.8 4.8 4.8
2.5 3.2 3.7 4.9 4.8 1.5 1.5 2.3 2.8
3 3.4 3.1 4.0 3.9 1.6 1.2 2.0 1.7
3.5 3.1 2.2 3.5 3.1 0.9 0.6 1.1 1.6
4 2.3 2.0 2.7 2.9 0.6 0.6 0.9 0.9
4.5–5 2.9 2.7 5.4 5.5 0.9 0.5 1.7 1.2
5.5–6 2.5 2.3 3.7 3.6 0.4 0.4 0.9 0.8
6.5–7 1.7 1.2 2.9 2.7 0.3 0.3 0.7 0.8
7.5–8 1.0 0.7 1.9 1.5 0.2 0.1 0.6 0.4
>8 4.0 2.7 7.5 6.9 0.5 0.6 1.4 1.4
  1. ADHD and ASD scores from the Autism—Tics, AD/HD, and other Comorbidities inventory (A-TAC)
  2. FF female with a female co-twin, FM female with a male co-twin, MF male with female co-twin, MM male with a male co-twin