Table 3.

The percent of children who had each combination of ultrasound lesions listed on the left who developed the Bayley Scale Index listed at the head of each column. These are row percents.

White matter lesion	Intraventricular hemorrhage	MDI		PDI		Row N
		<55	55-69	<55	55-69
No	No	12	11	11	14	690
	Yes	18	16	19	19	102
Yes	No	29	19	40	21	42
	Yes	34	9	44	11	70
Column N		138	104	146	133	904

Abbreviations: MDI – Mental Development Index; PDI – Psychomotor Development Index