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. Author manuscript; available in PMC: 2014 Jun 1.
Published in final edited form as: Mol Genet Metab. 2013 Apr 6;109(2):125–131. doi: 10.1016/j.ymgme.2013.03.020

Table 2.

Mean (SD) cognitive scores, along with statistical findings (R2, F, p) from hierarchical linear regression.

Statistical Findings
Age
 Group
Cognitive Variable PKU Control R 2 F p Δ R 2 Δ F Δ p
IQ 99 (13) 109 (11) ns 0.12 5.69 0.05
2-Back Errors 8.7 (5.3) 3.2 (2.4) 0.12 5.27 0.05 0.23 13.60 0.001
Recognition Span 5.2 (0.7) 5.7 (1.0) 0.19 9.76 0.005 0.08 4.23 0.05
Word List Learning 12.8 (3.3) 15.8 (1.7) 0.13 6.00 0.05 0.19 11.21 0.005
Word List Clustering 9.7 (5.1) 13.7 (3.4) 0.13 6.15 0.05 0.14 7.64 0.01
Verbal Fluency 17.0 (5.5) 22.1 (7.1) 0.09 4.21 0.05 0.14 7.17 0.05

Notes: ns = not significant; df for age and group varied because not all participants completed each task.