. 2011 Feb 7;127(3):e639–e646. doi: 10.1542/peds.2010-1421

TABLE 3.

Results of Comparisons in Memory Abilities Between Very Preterm and Term Adolescents at 16 Years

	Preterm			Term			Adjusted Mean Difference (95% CI)	Adjusted Mean Difference (95% CI), Controlling for PPVT-R Score
	n	Mean (SD)	Impairment (<2 SD)	n	Mean (SD)	Impairment (<2 SD)	Adjusted Mean Difference (95% CI)
California Verbal Learning Test
Trials 1–5 total T-score	307	42.0 (12.2)	19.5%	99	50.1 (9.9)	4.0%	−7.1 (−9.7–−4.5)^a	−5.2 (−7.5–−2.9)^a
Long Delay Free Recall z score	308	−0.7 (1.4)	10.7%	99	0.3 (0.9)	1.0%	−0.8 (−1.–−0.5)^a	−0.6 (−0.8,−0.3)^a
Rey-Osterrieth Complex Figure Test
Immediate recall raw score	302	15.9 (9.2)	—	101	22.4 (8.1)	—	−5.6 (−7.6–−3.6)^a	−3.9 (−5.7–−2.2)^a
Delayed recall raw score	298	15.6 (9.1)	—	101	22.2 (8.2)	—	−5.7 (−7.6–−3.7)^a	−4.0 (−5.7–−2.3)^a

Impairment was defined as a score that fell 2 SDs below the standard mean. Gender, maternal education, minority status, and single-parent household were adjusted for. Mean differences were adjusted for PPVT-R scores to take into account the effect of differential intelligence between the 2 groups.

P < .005.