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. Author manuscript; available in PMC: 2014 May 1.
Published in final edited form as: Pediatr Res. 2013 Sep 3;74(5):592–600. doi: 10.1038/pr.2013.143

Table 2.

Parameters and 95% CIs of the linear regressions for each method relative to the reference BioRBC density

Assay method Slope 95% CI of
slope		 Intercept 95% CI of
intercept		 R2
BioRBC 18 μg/ml 1.01 0.98 to 1.04 0.3266 −0.83 to 1.48 0.997
BioRBC 54 μg/ml 0.98 0.94 to 1.02 1.1777 −0.45 to 2.81 0.993
BioRBC 162 μg/ml 0.99 0.90 to 1.08 1.6459 −1.65 to 4.95 0.973
Kidd Jkb 0.91 0.78 to 1.04 5.6351 0.28 to 10.99 0.976
HbF flow cytometry 0.87 0.74 to 1.01 5.9154 −0.40 to 11.43 0.965
HbF HPLC 1.55 −0.72 to 2.39 −7.1417 −33.44 to 19.17 0.869

BioRBC densities, n=18; Kidd Jkb, n=9; HbF flow cytometry, n=10; HbF HPLC, n=6. Kidd Jka not included because of the small number of available study subjects (n = 5).