GSTM1 and Stillbirth: Summary estimates were created for low Hb and the odds of LBW, VLBW, PTB, SGA, stillbirth, perinatal mortality, and neonatal mortality by Hb concentration cutoff: ≤70, ≤ 80, ≤90, ≤ 100, and ≤ 110 g/L (Table 1).