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Erythrocyte analysis by sex and age in strain 13/N guinea pigs. Erythrocyte number (RBC), Hgb, and Hct are consistently higher in males than females. These parameters peak by 450 d and then decrease over time. Erythrocyte volume (MCV) has a bimodal distribution that is undifferentiated by age or sex. The solid and dashed red lines represent the mean and 95% CI, respectively, of each parameter. The shaded area represents the 95% predictive interval of each parameter.
