Table 3

Summary of the significant, false discovery rate adjusted, and cross-validated ADRA2C and ADRB1 polymorphism effects and interactions on age of onset, LVmass, LVEF, and heart failure survival

ED (N = 655)









Age of Onset
LVMass Adj*
LVEF Adj**
Survival



SNP Main Effects
SNP-SNP Interaction
SNP Main Effects
SNP_SNP Interaction
SNP Main Effects
SNP_SNP Interaction
SNP Main Effects
SNP_SNP Interaction


Number of tests
22
209
22
200
22
204
22
231
P < 0.10
2
24
1
8
2
16
4
50
FDR (<0.30)
0
0
0
0
2
0
4
44
Cross Validation***
0
0
0
0
1
0
3
10
FDR and Cross-validation
0
0
0
0
1
0
2
6

* LVMass was adjusted for age of onset, sex, height, weight, hypertension

** LVEF was adjusted for age of onset, sex

*** For survival analysis, Risk Index was used to cross-validate, P-value for Cox model with Risk Index <0.1 is considered as crossvalidated. For continuous outcomes, 4-fold CV was used. Press-Rsquared >0.005 (SNP univ model) or Press-Rsquared for full model >0 and Press-Rsquared Difference between full model and submodel >0.005 (Epistasis) is considered to be crossvalidated for interaction.

Kardia et al. BMC Medical Genetics 2008 9:93   doi:10.1186/1471-2350-9-93