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. Author manuscript; available in PMC: 2015 Apr 1.
Published in final edited form as: Psychol Med. 2014 Aug 14;45(5):977–983. doi: 10.1017/S0033291714001986

Table 4. Tetrachoric correlations among 127610 sibling pairs born in Sweden 1991–1995.

ADHD only (no stimulants) ADHD+ stimulants Stimulants only
ADHD only (no stimulants) 0.34 (0.04) 0.23 (0.04) 0.12 (0.05)
ADHD+stimulants 0.47 (0.02) 0.26 (0.04)
Stimulants only 0.46 (0.03)

ADHD, Attention-deficit/hyperactivity disorder.

Standard error given in parentheses.