Table 4. Predictive values of childhood measures on interview-based ADHD symptoms in adolescence and adulthood.

	r	t	F	df	p
ADHD symptoms
Inattention
Parent-rated	0.45	5.32	28.27	1/113	<0.01
Teacher-rated	0.01	0.13	0.02	1/107	0.90
Hyperactivity-Impulsivity
Parent-rated	0.43	4.97	24.72	1/112	<0.01
Teacher-rated	0.08	0.85	0.73	1/107	0.40
Activity level
Mean intensity	0.33	2.82	7.95	1/64	<0.01
Mean count	0.15	1.24	1.53	1/64	0.22
IIV intensity	0.27	2.20	4.85	1/64	0.03
IIV count	0.03	0.24	0.06	1/64	0.81
Co-occurring symptoms
Oppositional behaviours
Parent-rated	0.25	2.74	7.50	1/112	<0.01
Teacher-rated	0.09	0.98	0.95	1/106	0.33
Anxious/shy behaviours
Parent-rated	0.20	2.18	4.74	1/112	0.03
Teacher-rated	−0.07	−0.77	0.59	1/107	0.44
Social problems
Parent-rated	0.27	2.99	8.94	1/113	<0.01
Teacher-rated	0.07	0.75	0.56	1/107	0.47
Emotional problems
Parent-rated	0.36	3.52	12.40	1/85	<0.01
Teacher-rated	0.07	0.60	0.36	1/84	0.55
Social communication	0.23	2.53	6.38	1/113	0.01
SES	−0.20	−2.12	4.50	1/103	0.04
Cognitive performance
FIQ	−0.25	−3.47	12.03	1/101	<0.01
VIQ	−0.16	−2.28	5.21	1/99	0.02
PIQ	−0.29	−2.70	7.30	1/99	<0.01
Digit span forward	−0.13	−1.22	1.49	1/86	0.23
Digit span backward	−0.06	−0.55	0.31	1/86	0.58
RTV	0.03	0.22	0.05	1/53	0.83
OE	0.13	1.04	1.08	1/63	0.30
CE	−0.07	−0.56	0.32	1/63	0.58
Choice impulsivity	0.15	1.25	1.56	1/65	0.22