GSTM1 and Stillbirth: The odds of poor birth outcomes generally increased as Hb concentration decreased across cutoffs, with strongest associations at the lowest cutoff of ≤ 70 g/L for LBW (OR (95% CI) 2.06 (1.63–2.61)), PTB ≤ 70 g/L: (OR (95% CI) 2.08 (1.67–2.59)), stillbirth ≤ 70 g/L: (OR (95% CI) 2.85 (1.66–4.90)), perinatal mortality ≤ 70 g/L (OR (95% CI) 4.41 (2.21–8.81)) and neonatal mortality ≤ 70 g/L: (OR (95% CI) 1.83 (1.52–2.19)).