Table 2.

Mean latencies (sec) and mean number of errors recorded on the Trail-Making test (TMT: standard deviation in parentheses) by diagnostic group

		TMT-A		TMT-B		TMT B–A
Group	N	Latency	Errors	Latency	Errors	Increased Latency
ADHD	56	52.4 1, 3	0.16	150.1 2,4	0.89	99.9 1,4
		(30.3)	(0.06)	(101.6)	(0.18)	(78.6)
Siblings	40	41.1	0.18	110.8	0.85	69.7
		(18.5)	(0.18)	(70.7)	(0.21)	(56.2)
Controls	70	41.6	0.09	107.4	0.56	65.8
		(16.1)	(0.05)	(46.1)	(0.16)	(36.4)

¹p <.04,

²p<.03, ADHD vs. siblings:

³p<.03,

⁴p<.005, ADHD vs. controls