"Observational study of gene-disease association. (HuGE Navigator); A 48-bp repeat polymorphism in the DRD4 gene was studied. The odds ratios for any 2- or 5-repeat allele vs. 0 was 2.41 for total novelty-seeking 2.94 for exploratory excitability & 2.74 for impulsiveness but not for other components. of novelty seeking."xsd:string