G6PD and G6PD deficiency: The male-to-female ratio of 2.8 to 1 in Korean patients with decreased G6PD (<7.9 U/g Hb) was comparable to data from the public database by HIRA, in which the male-to-female ratio was approximately 3.3 to 1 among patients with G6PD deficiency in 2021, regardless of initial visits or follow-up [15].