Table 3.

Du Paul ADHD Rating Scale-IV SD scores in extremely preterm (EP; < 26 weeks gestation) children and term-born (≥37 weeks gestation) controls at 11 years of age by neurodevelopmental disability subgroup.

	Neurodevelopmental disability at 11 years* (number EP : Term)
	None	Mild	Moderate	Severe
	(30 : 97)	(73 : 35)	(50 : 2)	(19 : 0)
Mean (SD) Inattention SD score
EP	0.47 (1.4)	0.83 (1.3)	1.69 (1.5)	2.1 (1.5)
Term	−0.11 (0.9)	0.23 (1.1)	1.23 (0.2)	-
EP vs. Term
Mean difference (95% CI)	0.58 (0.13 to 1.02)	0.61 (0.11 to 1.11)	0.46 (−0.17 to 2.6)	-
Adjusted for IQ	0.50 (0.05 to 0.95)	0.38 (−0.11 to 0.85)	-	-
Mean (SD) Hyperactivity/Impulsivity SD score
EP	−0.05 (0.8)	0.27 (0.9)	0.69 (1.1)	1.25 (1.2)
Term	−0.06 (0.9)	0.13 (1.2)	0.54 (1.4)	-
EP vs. Term
Mean difference (95% CI)	0.00 (−0.37 to 0.38)	0.14 (−0.27 to 0.54)	0.15 (−1.5 to 1.8)	-
Adjusted for IQ	−0.14 (−0.03 to 0.004)	0.02 (−0.04 to −0.003)	-	-

^*Neurodevelopmental disability was classified using the child’s most severe level of impairment in any one or more of vision, motor, hearing or cognitive function. Detailed definitions have been published previously.²⁰