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Table 3 Pearson correlation coefficient between protoporphyrin IX and muscle quality index

From: Association between protoporphyrin IX and sarcopenia: a cross sectional study

Variables Average peak force (Newtons) Skeletal muscle index Gait speed
Protoporphyrin
(μg/dL RBC)
Correlation P value Correlation P value Correlation P value
−0.182 < 0.001 − 0.123 < 0.001 − 0.131 < 0.001