CXCL8 and hematocrit: In comparison between control and HT patients, two SNPs showed statistical differences: CCL11(rs3744508) AA (11.1% vs. 1.1%, OR = 11.3, Pc = 0.002) had a higher frequency in HT patients, whereas CXCL8(rs2227306) CC (27.8% vs. 49.2%, OR = 0.4, Pc = 0.018) had lower frequency in HT patients.