Table 3 Spearman correlation coefficients (95% CI) between baseline and follow-up levels by nail and serum status.

From: Toenail and serum levels as biomarkers of iron status in pre- and postmenopausal women: correlations and stability over eight-year follow-up

Serum measure

Spearman correlation coefficient between two time points (n = 86)

Difference between nail iron and serum correlation coefficients (n = 86)

Intraclass correlation coefficients (ICC)

Serum iron

0.3 (0.09, 0.51)

0.17 (− 0.11, 0.45)

0.35

Ferritin

0.58 (0.43, 0.73)

− 0.11 (− 0.34, 0.12)

0.29

Transferrin saturation

0.34 (0.15, 0.54)

0.13 (− 0.13, 0.39)

0.20

Nail iron

0.47 (0.3, 0.64)

 

0.35

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