Table 2. Parent-reported Child Behavior Checklist at 10 and 18 years in EP- and term-born children.

Boys				Girls
Age at follow-up:	10 years (n = 26)	18 years (n = 22)		10 years (n = 44a)	18 years (n = 38b)
CBCL scales	Estimated mean difference (95% CI) EP- vs. term-born	Estimated mean difference (95% CI) EP- vs. term-born	Tests of interaction group by age p-valuesc	Estimated mean difference (95% CI) EP- vs. term-born	Estimated mean difference (95% CI) EP- vs. term-born	Tests of interaction group by age p-valuesc
Total problem	37.3 (20.7, 54.0)	9.8(−8.9, 28.5)	0.03	9.6 (2.4, 16.8)	9.8 (2.1, 17.4)	0.97
Internalizing	10.3 (5.3, 15.3)	2.1 (−3.5, 7.7)	0.03	2.6 (−0.7, 5.8)	5.6 (2.2, 9.1)	0.20
Externalizing	11.1(4.9, 17.3)	2.2 (−4.8, 9.2)	0.06	2.3 (−0.7, 5.2)	1.8 (−1.4, 5.0)	0.82
Withdrawn	2.8 (1.1, 4.5)	0.3 (−1.6, 2.2)	0.06	1.3 (0.1, 2.5)	2.4 (1.2, 3.7)	0.21
Somatic complaints	1.8 (0.4, 3.2)	0.6 (−1.0, 2.2)	0.28	0.04 (−1.3, 1.4)	0.1 (−1.4, 1.6)	0.96
Anxious/depressed	6.2 (3.1, 9.2)	1.0 (−2.4, 4.4)	0.03	1.3 (−0.3, 3.0)	3.4 (1.7, 5.2)	0.08
Social problems	3.9 (2.3, 5.5)	1.7 (−0.1, 3.5)	0.07	2.6 (1.6, 3.6)	1.3 (0.2, 2.4)	0.09
Thought problems	2.2 (1.0, 3.3)	0.7 (−0.7, 2.0)	0.09	0.2 (−0.1, 0.5)	0.2 (−0.2, 0.5)	0.75
Attention problems	6.2 (3.7, 8.7)	2.8 (−0.03, 5.6)	0.07	2.2 (0.9, 3.4)	1.2 (−0.2, 2.6)	0.30
Delinquent behavior	2.2 (0.8, 3.7)	0.2 (−1.4, 1.8)	0.07	−0.02 (−0.8, 0.8)	0.1 (−0.7, 1.0)	0.78
Aggressive behavior	8.8 (3.8, 13.8)	2.0 (−3.6, 7.7)	0.08	2.3 (−0.2, 4.8)	1.6 (−1.0, 4.3)	0.73
Total competence	−3.2d (−6.1, −0.4)	−3.7e (−7.1, −0.2)	0.84	−3.8f (−5.8, −1.7)	−5.0e(−7.3, −2.8)	0.39
Activities	−0.5g (−1.7, 0.6)	−0.8g (−2.1, 0.5)	0.78	−1.4g (−2.4, −0.3)	−1.4g (−2.5, −0.3)	0.93
Social competence	−1.0d (−2.4, 0.5)	−1.2 (−2.8, 0.3)	0.81	−1.6g (−2.7, −0.5)	−2.0d (−3.2, −0.7)	0.66
School competence	−2.0 (−2.9, −1.0)	−2.0h(−3.2, −0.8)	0.96	−1.0g (−1.6, −0.4)	−0.6f (−1.3, 0.0)	0.38

Notes.

EP

extremely preterm

Higher score on each of the CBCL scales reflects more problems or better competencies.

^aTwo reports were missing.

^bOne report was missing.

^cMixed linear model. Interaction-terms assessing if the differences between the EP and the matched term-born control groups were different at ten and 18 years of age.

^dTwo missing.

^eFive missing.

^fThree missing.

^gOne missing.

^hFour missing.