GSTM1 and anemia (phenotype): As described in detail in Table 6, anemia is common for elderly individuals (approximately 10% of persons above 65 years of age) and the incidence rate increases with increasing age, but severe anemia with Hb below 11 g/100mL is seen only for 2% or less of individuals depending on the study population (Table 2, Table 5 and Table 6) [97,98,99,115,116,117,118,119,120,121,122,123,124,125,126,127].