Table 2.

Differences on mean IQs at 7 years based on neurodevelopmental assessment at 1 year.

Griffiths Scales 1 year (N = 99)		WISC-III 7 years (N = 99)
		Full Scale IQ
		Mean (SD)		p-value
General Quotient normal range	n = 78	105.6 (14.1)		0.005
General Quotient < 1 SD	n = 21	95.0 (17.5)
		Verbal IQ		Performance IQ
		Mean (SD)	p-value	Mean (SD)	p-value
Locomotor normal range	n = 70	106.8 (13.4)	0.114	102.7 (12.0)	0.024
Locomotor < 1 SD	n = 29	101.3 (19.8)		95.6 (18.0)
Personal-Social normal range	n = 82	107.0 (14.3)	0.010	101.9 (13.7)	0.044
Personal-Social < 1 SD	n = 17	96.4 (19.2)		94.2 (15.7)
Language normal range	n = 93	105.7 (15.0)	0.171	101.2 (13.9)	0.116
Language < 1 SD	n = 6	96.7 (24.3)		91.7 (19.2)
Eye–Hand Coordination normal range	n = 79	107.1 (14.1)	0.018	101.9 (13.4)	0.067
Eye–Hand Coordination < 1 SD	n = 20	97.9 (19.5)		95.4 (16.8)
Performance normal range	n = 82	107.7 (13.0)	0.000	102.4 (12.8)	0.004
Performance < 1 SD	n = 17	93.3 (21.5)		91.6 (17.9)

Student’s t-test on mean WISC-III IQs at 7 years, comparing low performing (scores < 1 SD) and normal performing (scores in the normal range) children at the Griffiths Scales at 1 year.