Table 2.

Correlation Coefficients for Brain-Behavior Relationships Between Corpus Callosum Segment Circumference and Behavioral Performance on Go/No-Go Task

	Genu	Rostral body	Midbody	Isthmus	Splenium
Mean reaction timea
ADHD + TD (n = 101)	0.09	0.18	0.16	0.11	0.04
Male	0.25	0.25	0.21	0.06	0.08
Female	0.14	0.01	0.04	0.16	–0.04
TD only (n = 45)	0.05	0.18	–0.06	–0.10	–0.16
Male	0.02	0.14	–0.06	–0.24	–0.26
Female	0.03	0.21	–0.10	–0.01	–0.09
ADHD only (n = 56)	0.13	0.17	0.40b	0.40b	0.21
Male	0.04	0.33	0.47b	0.34	0.29
Female	0.35	–0.40	0.24	0.54b	0.01
Intrasubject variabilitya
ADHD + TD	0.05	0.33c	0.04	0.03	0.11
Male	0.05	0.40b	–0.02	–0.10	0.05
Female	0.05	0.22	0.15	0.18	0.20
TD only	0.06	0.30	0.15	0.00	0.08
Male	0.00	0.51	0.07	–0.39	–0.11
Female	0.22	0.10	0.32	0.39	0.34
ADHD only	0.05	0.30	–0.07	0.10	0.12
Male	0.04	0.27	–0.14	0.16	0.13
Female	0.03	0.35	0.07	0.02	0.05
Commission errors
ADHD + TD	0.07	0.14	0.05	0.11	0.07
Male	0.14	0.28	0.04	0.09	0.06
Female	0.08	0.00	0.10	0.18	0.16
TD only	0.09	0.17	0.31	0.18	0.12
Male	–0.02	0.54b	0.44	–0.01	0.14
Female	0.30	–0.14	0.17	0.35	0.15
ADHD only	0.06	0.08	–0.19	0.06	0.02
Male	0.20	0.10	–0.27	0.14	0.00
Female	–0.18	0.18	0.03	–0.10	0.17

NOTE: TD, typically developing; ADHD, attention-deficit hyperactivity disorder.

^aBehavioral data were log-transformed.

^bP <.05

^cP < .01, after Bonferroni correction.