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. Author manuscript; available in PMC: 2016 May 1.
Published in final edited form as: J Pediatr. 2015 Mar 11;166(5):1152–1157.e6. doi: 10.1016/j.jpeds.2015.01.044

Figure 2.

Figure 2

Changes to the IRT assay over time in each site. The x-axis represents year of measurement, and each box indicated the type of assay used, including the (1) assay name, (2) manufacturer, (3) type of assay, and (4) percent of subjects in each site that used that assay.