Table 3: Pregnancy outcomes in cases and controls.

Pregnancy outcomeCase group ()Control group () value

Hospital admission ()27 (42%)20 (31%)0.13
ICU admission ()1 (2%)2 (3%)0.51
IUGR ()2 (3%)5 (8%)0.30
Hypertension/preeclampsia ()8 (13%)9 (14%)0.36
Placental abruption ()1 (2%)0 (0%)0.22
Median Hb at delivery, g/dL ()10.7 [9.8; 11.5]10.8 [9.8; 11.8]0.76
Median Hb at delivery, mmol/L ()6.7 [6.1; 7.1]6.7 [6.1; 7.3]0.76
Unknown Hb at delivery18 (28%)16 (25%)
Major adverse outcome ()
 Maternal only3 (5%)4 (6%)0.50
 Fetal only5 (8%)5 (8%)
 Maternal and fetal2 (3%)6 (9%)
Minor maternal outcome ()23 (36%)18 (28%)0.36
Need for transfusion of blood products ()2 (3%)3 (5%)0.20
Gestational age at delivery, weeks ()39.2 [38.0; 40.3]39.1 [36.7; 39.9]0.18
Mode of delivery ()
 Spontaneous vaginal46 (72%)39 (61%)0.29
 Assisted vaginal2 (3%)5 (8%)
 Primary Caesarean9 (14%)12 (19%)
 Secondary Caesarean5 (8%)8 (13%)
Blood loss during delivery, mL ()300 [200; 400]300 [200; 538]0.64
Fetal weight, g ()
 Singleton babies3235 [3025; 3565]3210 [2710; 3500]0.64
 Twin babies2400 [1872; 2721]2343 [1675; 2618]0.33
Apgar score ()
 Singleton babies10 [10; 10]10 [9; 10]0.73
 Twin babies9 [7; 10]9 [7; 10]0.92

Data shown as median [IQR] or (%); patients with available data (for remainder of study population not reported/unknown).
Minor maternal outcomes: malaise (2 in case group), abdominal pain (3 in case group, 2 in control group), nausea and vomiting of pregnancy (NVP) (3 in case group, 3 in control group), premature contractions (3 in case group), Preterm Premature Rupture Of Membranes (PPROM) (4 in case group, 5 in control group), impaired renal function (1 in case group), meconium amniotic (1 in case group), vaginal blood loss (1 in case group, 1 in control group), preeclampsia (3 in case group), hypertension (2 in case group, 3 in control group), severe hypertension (1 in case group), postpartum hypertension (1 in control group), fever (2 in case group), postpartum fever (2 in control group), urinary tract infection (2 in case group), trauma (1 in case group), reduced signs of fetal life (2 in case group), back pain (1 in case group), tachycardia (1 in case group), gestational diabetes (2 in case group, 1 in control group), herpes gestationis (1 in case group), gestational pyelitis (1 in control group), pulmonary embolism (1 in control group), and positive discongruence (1 in control group).
Hb: hemoglobin; IQR: interquartile range; ICU: intensive care unit; IUGR: intrauterine growth retardation.