Pregnancy nausea related to women's obstetric and personal histories.

We report the correlation between total hours of nausea in early pregnancy, as a continuous variable, and various factors in women's obstetric and personal histories. Positive correlations for increased nausea were found with heavier placentae (p = 0.005), non-smoking status (p = 0.004), women with nausea in previous pregnancies (p = 0.005), and women whose mothers experienced trouble with nausea in their pregnancies (p = 0.001). 17 other factors did not relate to pregnancy nausea at the p < 0.01 level.