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. Author manuscript; available in PMC: 2012 Jul 1.
Published in final edited form as: Congenit Heart Dis. 2011 Mar 25;6(4):313–321. doi: 10.1111/j.1747-0803.2011.00496.x

TABLE 2.

The Proportion of Variance (Model R2) in Log Transformed Brain Natriuretic Peptide Concentrations* Explained in Multivariable Analysis by Groups of Variables

Variable Group n Number of
Variables		 R2 Adjusted R2**
Demographics 510 8 0.08 0.06
Pre-Fontan characteristics 510 20 0.05 0.02
Fontan characteristics 510 31 0.15 0.10
Post-Fontan characteristics 510 14 0.05 0.03
Parent-completed CHQ summary scores 483 2 0.02 0.01
Parent-completed CHQ domain scores 504 15 0.08 0.05
Parent-completed CHQ health conditions 504 15 0.10 0.08
Cardiopulmonary exercise testing 131 6 0.06 0.02
Echocardiography† 389 16 0.17 0.14
Magnetic resonance imaging 151 7 0.11 0.09
*

analyzed after logarithmic transformation (with the natural base) to normalize the distribution

**

adjusted for the number of variables in the model

CHQ, Child Health Questionnaire

†

Missing echocardiographic variable values were imputed from the subset with mass-volume data