Also Capoluongo et al. have published a similar study that showed GSTM1 null-genotype is a risk factor for hypertension among elderly subjects (OR = 2.25, 95% CI = 1.36–3.72;P = 0.005), while null GSTT1 genotype was a minor risk factor for hypertension (OR = 1.24, 95% CI = 0.67-2.29, P = 0.52). Here, GSTM1 is linked to hypertensive disorder.