Table 4.

Outcome raw scores of development and cognition using Bayley Scales of Infant and Toddler Development III (BSID III) and Wechsler Preschool Primary Scales of Intelligence IV (WPPSI IV) measured at 2 and 5 years, respectively

	Mean	sd	Median	IQR
Development scores at 2 years (N 227*)
Cognition	59·5	3·4	59	57–62
Expressive language	27·8	4·7	29	25–31
Receptive language	26·9	2·5	27	25–29
Cognition scores at 5 years (N 212)
Verbal	37·9	9·2	39	32–44
Performance	48·2	9·8	48	42–54
Processing speed	35·8	18·4	35	22–50

IQR, interquartile range.

^*Of the 228 children who completed 2 years of follow-up, one subject did not have complete developmental raw scores.