Research Article

Apolipoprotein D Concentration in Human Plasma during Aging and in Parkinson’s Disease: A Cross-Sectional Study

Figure 2

Age-dependent TNF-α concentration in human plasma. One-way analysis of variance (ANOVA) and Student’s t-test with Tukey’s post hoc were used. Horizontal lines show the average distribution of age-related ApoD concentration in human plasma in group I (mean 0.188 ± 0.1 pg/ml, , and 20–40 years), group II (mean 0.24 ± 0.05 pg/ml, , and 40–65 years), and group III (0.61 ± 0.15 pg/ml, , and >65 years). The increase in TNF-α concentration in human plasma was significant between groups I and II () and between groups II and III ().