Figure 3

Dot plots of Cut-Off Index. The Cut-Off Index is plotted for four populations: patients who received hepatitis B vaccine 7 days or less prior to HBsAg testing, patients who received vaccine 8–14 days prior to HBsAg testing, patients with grayzone HBsAg reactions not attributed to vaccine or to actual hepatitis B virus infection, and patients with grayzone reactions who appear to have actual hepatitis B virus infection. The dashed line is at the Cut-Off Index of 1 which divides non-reactive from grayzone.