Table 1.

Comparisons in BSID II subscales with normative group pre- and post-operation.

Subscale	M	SD	t*	P value
Pre-MDI	83.89	8.36	7.26	<0.01
Pre-PDI	81.23	8.32	8.49	<0.01
Post-MDI	90.11	7.65	4.32	<0.01
Post-PDI	86.09	6.83	6.21	<0.01

^*Compared with BSID age-based norms.