Table 3: Characteristics of the women in the 2 groups.

Preemptive* () Control* () Mean age year (SD) 32.2 (4.7) 31.3 (3.2) 0.37 BMI (SD) 25.2 (5.7) 27.3 (6.6) 0.2 Some associated medical conditions        Motion sickness 7 4 N.S.  Acid reflux/indigestion 23 27 N.S.  Depression/anxiety 8 16 0.04  Low iron/anemia 15 9 N.S.  Headaches/migraines 5 17 0.01  HG in previous pregnancy 20 11 0.07

*Mean # of followup per patient in each group: 8 (SD 1.8).