Table 2.

ADHD symptoms in extremely preterm (EP; < 26 weeks gestation) children and term-born (≥37 weeks gestation) controls at 11 years of age assessed using the Du Paul ADHD Rating Scale-IV.

All children
	Term	EP	Difference in means
	Mean (SD)	Mean (SD)	Raw score (95% CI)	SD score# (95% CI)
Parent Scores	n=140	n=189
Inattention	3.6 (4.1)	8.8 (6.9)	5.1 (3.8 to 6.4)***	1.3 (0.9 to 1.6)***
Hyperactivity/Impulsivity	2.6 (4.1)	5.3 (5.5)	2.7 (1.6 to 3.8)***	0.7 (0.4 to 0.9)***
Teacher Scores	n=146	n=197
Inattention	3.3 (4.9)	7.9 (7.1)	4.6 (3.3 to 6.0)***	1.0 (0.7 to 1.2)***
Hyperactivity/Impulsivity	2.1 (4.2)	3.7 (5.4)	1.6 (0.6 to 2.7)**	0.4 (0.1 to 0.6)**
Children with both parent & teacher data
	Term	EP	Difference in means
	Mean (SD)	Mean (SD)	Raw score (95% CI)	SD score# (95% CI)
Parent Scores	n=134	n=172
Inattention	3.7 (4.2)	8.7 (6.7)	5.0 (3.7 to 6.3)***	1.2 (0.9 to 1.5)***
Hyperactivity/Impulsivity	2.6 (4.2)	5.2 (5.4)	2.6 (1.5 to 3.7)***	0.6 (0.4 to 0.9)***
Teacher Scores	n=134	n=172
Inattention	3.0 (4.6)	7.0 (6.5)	3.9 (2.6 to 5.3)***	0.8 (0.6 to 1.1)***
Hyperactivity/Impulsivity	2.1 (4.3)	2.9 (4.4)	0.8 (−0.2 to 1.8)	0.2 (−0.0 to 0.4)
Mean of parent & teacher	n=134	n=172
Inattention	3.3 (4.9)	7.9 (7.1)	4.5 (3.3 to 5.6)***	1.2 (0.9 to 1.5)***
Hyperactivity/Impulsivity	2.1 (4.2)	3.7 (5.4)	1.7 (0.8 to 2.7)**	0.5 (0.2 to 0.7)**
Mean of parent & teacher in children with MPC ≥90 at 11 years $	n=124	n=74
Inattention	3.1 (3.7)	5.4 (5.3)	1.5 (0.24 to 2.8)*	0.42 (0.10 to 0.75)*
Hyperactivity/Impulsivity	2.2 (3.5)	2.7 (3.6)	0.1 (−0.9 to 1.2)	0.05 (−0.23 to 0.33)

Higher scores indicate greater ADHD symptoms.

^#SD Standard Deviation score using the term-born controls as the reference (term control group mean = 0; SD = 1).

^$Adjusted for MPC at 11 years.

^*p<0.05,

^**p<0.01,

^***p<0.001.