. Author manuscript; available in PMC: 2016 Jul 8.

Published in final edited form as: Am J Hum Biol. 2014 Dec 3;27(4):579–581. doi: 10.1002/ajhb.22664

Table 1.

Correlation coefficients and mean differences between dried blood spot (DBS)-based and venous-based glycosylated hemoglobin values, by assay protocols, type of chemistry analyzer, and pre-treatment of filter paper (N=40 for each of the 6 categories).

Assay protocol	Type of chemistry analyzer	Pre-treatment of filter paper
		Yes		No

		Correlation coefficient	Mean difference (%)	Correlation coefficient	Mean difference (%)
University of Washington	Bio-Rad	0.996	−2.2 ^*	0.998	−0.9
	Olympus	0.991	1.4	0.989	1.6
SAGE ^†	Olympus	0.984	1.2	0.985	1.4

The mean difference is negative when DBS values are lower than the corresponding venous results and positive when DBS values are higher than venous results.

^†

The Study of Global AGEing and Adult Health