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. Author manuscript; available in PMC: 2021 May 20.
Published in final edited form as: Psychol Med. 2018 Sep 17;49(11):1841–1849. doi: 10.1017/S0033291718002532

Table 3.

Familial co-aggregation of ADHD and obesity

Risk of obesity in relatives of
Individuals with ADHD
 Risk of obesity in relatives of
Individuals without ADHD
Type of siblings Pairs, No. % (95% CI) % (95% CI) RD (95% CI), % RR (95% CI)
Full siblings 2 703 662 2.91 (2.78 - 3.04) 1.80 (1.78 - 1.81) 1.11 (0.98 - 1.24) 1.62 (1.55 - 1.69)
Half siblings 914 064 3.68 (3.51 - 3.84) 2.80 (2.76 - 2.84) 0.88 (0.71 - 1.04) 1.31 (1.25 - 1.37)
  Maternal half siblings 441 956 3.79 (3.56 - 4.02) 2.94 (2.88 - 2.99) 0.86 (0.62 - 1.09) 1.29 (1.21 - 1.37)
  Paternal half siblings 472 108 3.56 (3.33 - 3.79) 2.67 (2.63 - 2.72) 0.88 (0.65 - 1.12) 1.33 (1.24 - 1.42)
Full Cousins 10 158 536 2.70 (2.63 - 2.76) 2.03 (2.02 - 2.04) 0.67 (0.61 - 0.74) 1.33 (1.30 - 1.36)

RD: risk difference; RR: risk ratio; CI: confidence interval;

All models were adjusted for age at the end of observational period and sex of both the index person and the relative, and ADHD status of the relative