Table 5 Correlation of various parameters with hypothesized associations with circulating vitamin C levels
Correlations with Vitamin C Concentrations (Natural Log Transformed) | |||||||
|---|---|---|---|---|---|---|---|
Statistic / Grouping | CRP (mg/L) -natural log transformation | Predialysis hemoglobin (mg/dL) | Equilibrated per session Kt/V urea | ePCR (g/kg/d) | Predialysis Parathyroid hormone | Physical Health Composite score | Dialysis weekly standard Kt/V |
Pearson correlation (complete cohort) | −0.10 (P = 0.59) [N = 34] | 0.32 (P = 0.03) [N = 44] | − 0.05 (P = 0.77) [N = 44] | 0.19 (P = 0.21) [N = 44] | − 0.31 (P = 0.04) [N = 44] | 0.12 (P = 0.44) [N = 44] | − 0.07 (P = 0.64) [N = 44] |
3×, Pearson correlation | −0.15 (P = 0.58) [N = 16] | 0.35 (P = 0.13) [N = 20] | −0.07 (P = 0.78) [N = 20] | 0.21 (P = 0.37) [N = 20] | −0.31 (P = 0.19) [N = 20] | 0.35 (P = 0.13) [N = 20] | − 0.16 (P = 0.49) [N = 20] |
6×, Pearson correlation | −0.08 (P = 0.76) [N = 18] | 0.38 (P = 0.07) [N = 24] | −0.10 (P = 0.66) [N = 24] | 0.12 (P = 0.58) [N = 24] | −0.36 (P = 0.09) [N = 24] | −0.21 (P = 0.32) [N = 24] | + 0.07 (P = 0.76) [N = 24] |
Spearman correlation (complete cohort) | −0.19 (P = 0.28) [N = 34] | 0.34 (P = 0.02) [N = 44] | −0.08 (P = 0.63) [N = 44] | 0.19 (P = 0.23) [N = 44] | −0.16 (P = 0.30) [N = 44] | 0.10 (P = 0.52) [N = 44] | − 0.12 (P = 0.43) [N = 44] |
3×, Spearman correlation | −0.31 (P = 0.25) [N = 16] | 0.33 (P = 0.16) [N = 20] | −0.16 (P = 0.50) [N = 20] | 0.09 (P = 0.70) [N = 20] | 0.11 (P = 0.63) [N = 20] | 0.47 (P = 0.04) [N = 20] | − 0.31 (P = 0.19) [N = 20] |
6×, Spearman correlation | −0.07 (P = 0.77) [N = 18] | 0.30 (P = 0.16) [N = 24] | −0.10 (P = 0.66) [N = 24] | 0.12 (P = 0.58) [N = 24] | −0.40 (P = 0.06) [N = 24] | −0.22 (P = 0.30) [N = 24] | + 0.04 (P = 0.86) [N = 24] |