GSTM1 and anemia: In addition, this study revealed that postpartum anemia after CD was strongly associated with a predelivery Hb level; the odds of postpartum anemia after CD were 14.5 times higher among women with predelivery Hb level of less than 11gm/dL, compared to those who had normal predelivery Hb level (>/ = 11gm/dL).