GSTM1 and pulmonary arterial hypertension: The characteristics, risk factors and outcome parameters in the 296 women (Table 1) showed PPH in 96.6% of patients, mean MBL 1300 ml (interquartile range [IQR] 900–1900 ml), and mean ∆-Hb 39 g/l (IQR 26–54 g/l); 4.5% of women needed blood transfusion.