Table 2.

Preterm/Full-Term Differences: 36-months

	Full-terms			Preterms
	N	M	SD	N	M	SD	t-test
Memory
Immediate Recognition (composite)
Rose VPC (% Novelty)	108	58.47	6.34	50	55.52	6.53	2.70**
Fagan VPC (% Novelty)	108	61.69	5.78	48	59.66	6.45	1.95*
Delayed Recognition (% Novelty)	96	61.89	7.61	44	62.76	6.74	.65
Recall – elicited imitation (% Correct)	99	76.83	16.32	49	69.13	20.59	2.47**
Short-term Capacity (Span length)	109	4.22	1.02	49	4.26	1.00	.26
Processing Speed
Encoding speed – (trials to criterion)	101	18.57	10.66	48	23.20	11.52	2.42*
Reaction time baseline – VExP (ms)	96	209.12	31.43	45	207.13	30.12	.36
Reaction time post baseline – VExP (ms)	106	229.48	30.79	46	232.84	33.97	.60
Representational Competence
Cross-Modal (% Novelty)	105	48.28	4.36	48	46.79	5.81	1.76†
Anticipations –VExP (%)	106	20.68	12.45	46	17.70	11.53	1.38
Attention
Mean look duration (compositea)	109	-0.11	.55	50	.21	.68	3.11**
Shift rate (compositea)	109	.10	.76	50	-.22	.58	2.58**
Mental Development
Bayley MDI	106	89.61	13.45	50	85.00	11.56	2.09*

Note 1. VPC = Visual Paired-Comparison Task; VExP = Visual Expectation Paradigm

Note 2. Children took longer to reach criterion than at 24 months because familiarization times were shorter and the criterion was more stringent

^aMean of standardized values.

^†p ≤ 0.10.

^*p ≤ .05.

^**p ≤ .01.