IL18 and atrial fibrillation: Regarding the allelic distribution and frequencies of IL18-607 C/A SNP, unconditional logistic regression with adjustments for ethnicity and sex shows significant differences between AF and UC [p = 0.015; OR = 3.1 (95% CI: 1.24–7.77)] with a higher frequency of the A-allele in AF (53.8%) than in UC (26.5%) (Tables 4, 5).