Table 2.

Risk for bipolar disorder and schizophrenia in relatives to probands with ADHD and controls matched on birth year and gender.

	Bipolar disorder in relatives			Schizophrenia in relatives
	Probands N (%)	Controls N (%)	OR (95% CI)	Probands N (%)	Controls N (%)	OR (95% CI)
First-degree relatives
Parents	986 (0.95)	4835 (0.51)	1.84 (1.72–1.97)	366 (0.35)	1503 (0.16)	2.22 (1.99–2.47)
Offspring	52 (0.28)	187 (0.12)	2.54 (1.92–3.35)	15 (0.08)	75 (0.05)	1.89 (1.13–3.15)
Full siblings	319 (0.52)	1212 (0.23)	2.22 (1.98–2.50)	142 (0.23)	676 (0.13)	1.71 (1.44–2.04)
Second-degree relatives
Maternal half-siblings	88 (0.44)	135 (0.32)	1.26 (1.01–1.58)	33 (0.17)	54 (0.13)	1.11 (0.78–1.58)
Paternal half-siblings	84 (0.38)	132 (0.29)	1.34 (1.06–1.71)	44 (0.20)	73 (0.16)	1.06 (0.79–1.43)