Furthermore, as shown in Figure 2 , the CO breath test data exhibited a highly significant positive linear correlation with the biotin-labeling data, with all data points approximating a least-squares regression line with a slope of 1.0, indicating that the RBC lifespan values calculated by the two methods were almost equal.
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A Modified Carbon Monoxide Breath Test for Measuring Erythrocyte Lifespan in Small Animals.
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The sentences
The accumulated concentration of exhaled CO showed an increasing trend with increasing ribavirin treatment dosage, though the group differences did not reach statistical significance.