Donor 2 (n = 25) 3 (n = 25) 4 (n = 25)
Diluent Saline Saline 87.5%,
saliva 12.5% 		Saliva Saline Saline 87.5%,
saliva 12.5% 		Saliva Saline Saline 87.5%,
saliva 12.5% 		Saliva
Spearman´s rank correlation 0.99 0.983 0.984 0.987 0.988 0.988 0.987 0.986 0.984
Pearson correlation 1 1 1 1 1 1 1 1 0.999
Slope 13.261 13.445 13.051 12.568 12.437 12.469 16.271 16.39 16.118
Y-intercept -0.013 0.007 0.099 -0.006 0.009 0.05 -0.01 0.011 0.092

Blood was diluted with either saline only (reference/golden standard), saline 87.5%/saliva 12.5% or saliva only. The correlations were overall close to one and the slopes for measurements within a single donor showed high consistency.
The trend of differences in Y-intercept that could be observed within the measurements from every donor reflects the impact of saliva on the measurements.