GSTM1 and hypothyroidism: FT3: ▴ with Hb and SFTT3: ▴ with HbFT4: ▴ with Hb and SFTT4: ▴ with Hb and SFTSH: ▾ with Hb and SF* In mothers with ID or IDA, levels of FT3 and FT4 were ↓, while level of TSH and frequency of hypothyroidism were ↑.