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Table 2 Summary statistics for correlation and agreement between CD4+ T cells in ST samples measured on Day 7 and Day 14 (index test), and CD4+ T cells in EDTA samples measured on Day 0 (reference test)

From: Opportunities to improve storage and transportation of blood specimens for CD4 testing in a rural district in Zimbabwe using BD vacutainer CD4 stabilization tubes: a stability and diagnostic accuracy study

Test N Median p-value (EDTA Day 0) R2 Spearman's rho Mean bias (95% CI) Standard deviation of bias Limits of agreement
CD4 ST Day 7 49 480 0.30 0.957 0.977 -4.89 (-18.34 to 8.54) 46.81 -98.52 to 88.72
CD4 ST Day 14 19 500 0.71 0.936 0.963 5.10 (-20.13 to 30.34) 52.35 -99.61 to 109.82
CD4% ST Day 7 46 24.15 0.17 0.936 0.948 -0.53 (-1.14 to 0.06) 2.02 -4.59 to 3.51