The level of G6PD deficiency was categorized as high level (<0.6 IU/g·Hb) with 79 patients (23.30%), medium level (0.6–3.6 IU/g·Hb) with 233 patients (68.74%), and low level (3.6–9 IU/g·Hb) presented in 27 patients (7.96%). Here, GSTM1 is linked to G6PD deficiency.