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. Author manuscript; available in PMC: 2020 Mar 1.
Published in final edited form as: J Allergy Clin Immunol. 2018 Nov 20;143(3):1255–1257. doi: 10.1016/j.jaci.2018.10.057

Figure 1. Inter-laboratory correlation results for serotypes 4 (1a), 20 (1b), and 23F (1c).

Figure 1.

X axis values represent pneumococcal IgG antibody levels (μg/ml) for laboratory A, with Y axis values representing antibody levels from laboratories B (open circle) or C (solid circle). Boxes show correlation coefficients (r) for each inter-laboratory comparison. There was strong correlation (r ≥0.70) across all three comparisons for only one serotype (serotype 4, Figure 1a). There was weak correlation (r ≤0.50) for all three comparisons for four serotypes (including serotype 20, Figure 1b). There was strong correlation between A and C, with weaker correlation for other comparisons for eight serotypes (including serotype 23F, Figure 1c).