IL1B and major depressive disorder: IL1B rs16944 ‘G’ allele carriers also showed higher level of depression (ZDS was 40.6±8.8, 39.2±7.3 and 38.0±8.0 in case of ‘G/G’, ‘A/G’ and ‘A/A’ genotypes, respectively, p-value=0.025 in log additive model).