GSTM1 and Stillbirth: The relationship between low Hb concentration (n = 21) and stillbirth, with all Hb cutoffs and times during pregnancy combined, was significant (OR (95% CI); 1.49 (1.15−1.92)), and the same was true for high Hb (n = 4) (OR (95% CI); 1.88 (1.21−2.91)) (Tables 1 and 2).