GSTM1 and hematoma: The multivariate analysis showed that higher Hb levels (OR = 1.447, 95% CI: 1.115–1.877) and hematoma volumes at admission (OR = 1.057, 95% CI: 1.015–1.101) and having received surgical treatments consisting of either burr-hole trephination or craniotomy (OR = 5.340, 95% CI: 1.665–17.122) increased the risk of poor outcomes after ICH.