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. Author manuscript; available in PMC: 2010 Oct 1.
Published in final edited form as: Arch Gen Psychiatry. 2009 Oct;66(10):1116–1123. doi: 10.1001/archgenpsychiatry.2009.128

Figure 4. Scatter-plot of peak antibody response by % cocaine-negative urines.

Figure 4

Filled diamonds are individual vaccinated subject values for peak antibody response (typically at week 16) plotted against their percentage of cocaine-negative urines using the Preston criteria for new uses of cocaine during weeks 8 through 20. The graph is divided into quadrants by a horizontal line at the 43 ug/ml antibody and a vertical line at 50% cocaine free urines. The numbers in each quadrant represent the number of subjects in each quadrant. The proportion of subjects who had 50% or more cocaine free urines is significantly greater in those with anti-cocaine IgG antibody > 43 ug/ml than those with lower antibody levels (Fishers test, P<0.04).