Table 2. Evolution of cognitive development from 6 to 12 months in preterm and full-term infants.

	Mean*	SD	SE	95%CI	t	DF	p-value
Full-term group	4.2	13.9	3.1	2.29–10.79	1.36	19	0.190
Preterm group	7.8	13.6	3.1	1.45–14.25	2.57	19	0.019
Total sample	6.1	13.8	2.2	1.64–10.46	2.78	39	0.008

^*Mean refers to the variation in the cognitive score between six and 12 months in each group. SD: standard deviation; SE: standard error; CI: confidence interval; t: T test for repeated measures; DF: degrees of freedom.