Table 2.

Scores on NEPSY Statue and WMS-III Spatial Span assessments, tested for group differences at each timepoint and for effect of group × time.

Assessment	Timepoint	n, VLBW, control	VLBW mean ± SD	Term-born mean ± SD	d	p-value	LME p-value
Statue	1	n = 26, 127	28.4 ± 3.1	27.6 ± 3.1	0.25	0.25	0.21
	2	n = 29, 90	28.5 ± 2	28.7 ± 1.9	−0.13	0.55
Spatial span	1	n = 26, 128	11.7 ± 2.9	12.6 ± 2.9	−0.32	0.14	0.51
	2	n = 29, 87	12.1 ± 2.9	13.9 ± 2.9	−0.62	0.005*

Group differences tested using the general linear model, controlled for age, shown with effect size and number of participants included in each analysis. Statistically significant results are denoted by *. LME p-value refers to the longitudinal interaction analyses (score × time). Abbreviations: CI: confidence interval; d: Cohen’s d; LME: linear mixed effects; VLBW: very low birth weight.