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. Author manuscript; available in PMC: 2018 Jan 1.
Published in final edited form as: Sex Transm Dis. 2017 Jan;44(1):6–10. doi: 10.1097/OLQ.0000000000000541

Figure 2.

Figure 2

Box plots of decrease in nontreponemal antibody titers based on baseline RPR titers and month (s) after therapy (x-axis). Decline in titers were represented as decimal values in the y-axis, in which 0.5 indicated a 2-fold decline in titers (e.g. 1:16 at one month divided by baseline titer of 1:32, or 16/32=0.5); 0.25 indicated a 4-fold decline; and 0 indicated seroreversion. The box for each baseline titer represented the 25–75th interquartile range, with lines indicating the median value for decline in titers. Each panel also illustrates the range of values outside of the intra-quartile range (whiskers) and outliers (circles) for each baseline titer. The number of observations that corresponded to the baseline titers are included at the bottom of each panel.