Appendix B

The content in this publication was current at the time it was published, but it is not being updated. The publication is provided for historical purposes only.

Table 10. Summary of Stepwise Regression for PKUCS Adult WAIS_R IQ Scores

(Possible predictors include: Age first treated, Parent IQ, Father's Education, Years on Diet, and Phe Levels at Diagnosis, 6 years, 10 years and Currently)

Dependent Variable VERBAL IQ

Step	Variable Entered	Number In	Partial R**2	Model R**2	F to Enter	Prob>F
1	Phe @ 10 yrs	1	0.2494	0.2494	17.2819	0.0001
2	Parent IQ	2	0.0904	0.3399	6.9853	0.0109
3	Age 1st Treated	3	0.0315	0.3714	2.5089	0.1195
4	Adult Phe	4	0.0379	0.4093	3.1405	0.0826

Dependent Variable PERFORMANCE IQ

Step	Variable Entered	Number In	Partial R**2	Model R**2	F to Enter	Prob>F
1	Father's Ed	1	0.2031	0.2031	13.2542	0.0006
2	Age 1st Treated	2	0.1064	0.3095	7.8563	0.0071
3	Adult Phe	3	0.1182	0.4277	10.3281	0.0023

Dependent Variable WAIS-R FULL SCALE IQ

Step	Variable Entered	Number In	Partial R**2	Model R**2	F to Enter	Prob>F
1	Phe @ 10 yrs	1	0.2438	0.2438	16.7616	0.0001
2	Parent IQ	2	0.0909	0.3347	6.9713	0.0110
3	Age 1st Treated	3	0.0415	0.3762	3.3290	0.0740
4	Adult Phe	4	0.0732	0.4494	6.5103	0.0139

*Subset of Patients Who Discontinued by Age 8*

Dependent Variable WAIS-R FULL SCALE IQ

Step	Variable Entered	Number In	Partial R**2	Model R**2	F to Enter	Prob>F
1	Phe @ 10 yrs	1	0.2857	0.2857	12.7993	0.0011
2	Fatder's Ed	2	0.1405	0.4263	7.5939	0.0097

Back to Appendix B Figures and Tables

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