Figure 3. Antibody Duration Based on Gender And Prior Pregnancy.
There was a statistically-significant decrease in duration of antibody positivity between male and female patients (p=0.005). No prior pregnancy significantly decreased the duration of antibody positivity compared to having been previously pregnant (p=0.01). However, there was no effect based on the number of prior pregnancies. The data are plotted until the last patient in each group became antibody-negative.