GSTM1 and anemia (phenotype): *Column percentage backward classes=SC, ST, OBC; no anemia=blood Hb level >12.0 g/dL, mild anemia=Hb: 11-11.9 g/dL, moderate anemia=Hb: 8-10.9 g/dL, severe anemia=Hb <8 g/dL.#Independent-sample Kruskal-Wallis test.**Fisher's exact test.