IL6 and depressive symptom measurement: The ‘C’ allele of IL6 SNP rs2069835 was linked to increased level of depression (mean ZDS±SD were 39.2±7.8, 42.2±9.2, and 45.3±10.1 in case of ‘T/T’, ‘T/C’ and ‘C/C’ genotypes, respectively, p=0.003 in log-additive model).