Systolic and diastolic white coat hypertension were present in only 3.2% and 4.2% of the group, respectively. A systolic white coat effect>or = 20 mmHg was found in only 4.2% but 20.2% (26% for day assessment unit patients vs 15% for inpatients; P = 0.17) had a diastolic white coat effect>or = 10 mmHg. There was no difference in maternal or fetal outcomes between women with and without a white coat effect.