FT3:t1 (n = 594): ▴ with Hb, TfRt2 (n = 647): ▴ with Hb, SF* In mothers with anemia (Hb < 10 g/L), FT3 levels were ↓.FT4:t1 (n = 594): ▴ with Hb, SF, BISt2 (n = 647): ▴ with Hb* In mothers with anemia (Hb < 10 g/L) or negative BIS, frequency of low FT4 was ↑ in t3.* In mothers with negative BIS, FT4 levels were ↓ in t3.TT4:t1 (n = 594): ▴ with SF, BISt2 (n = 647): ▴ with HbTSH:t1 (n = 594): ▾ with TfRt2 (n = 647): ─Tg:t1 (n = 594): ─t2 (n = 647): ─. Here, GSTM1 is linked to anemia (phenotype).