. Author manuscript; available in PMC: 2014 May 1.

Published in final edited form as: Vox Sang. 2013 Jan 7;104(4):317–323. doi: 10.1111/vox.12006

Table 1.

Paired comparisons of hemoglobin determinations by three methods

	n	Hemoglobin g/dL (mean ± SD)	Mean Difference (g/dL)^*	Relative Error (%)^†	r (Pearson correlation coefficient)	p value

Capillary HemoCue vs.	150	14.05 ± 1.51	0.59	4.25	0.87	0.007
Venous HemoCue	150	13.89 ± 1.31	0.59	4.25	0.87	0.007

Capillary HemoCue vs.	150	14.05 ± 1.51	0.69	5.08	0.88	<0.001
Venous Cell-Dyn 4000	150	13.62 ± 1.23	0.69	5.08	0.88	<0.001

Venous HemoCue vs.	150	13.89 ± 1.31	0.38	2.80	0.97	<0.001
Venous Cell-Dyn 4000	150	13.62 ± 1.23	0.38	2.80	0.97	<0.001

Capillary HemoCue #1 vs.	50	13.72 ± 1.64	0.76	5.57	0.84	0.92
Capillary HemoCue #2	50	13.70 ± 1.73	0.76	5.57	0.84	0.92

Differences expressed as absolute values

^†

Relative error refers to the difference between the approximated value (capillary HemoCue hemoglobin) and the exact value (venous Cell-Dyn hemoglobin), divided by the exact value, and given as a percent. Venous HemoCue values were considered more exact than capillary values.