Table 3.

Analysis of plasma amino acid plasma levels and dietary practices (natural protein and special amino acid mixture intake) according to ferritin levels using multilevel linear regression

	Regression coefficient (95% CI)	p value
Natural protein intake (g/kg/day)	− 72.1 (− 119.6; − 24.5)	0.003
Special mixture of precursor-free amino acids intake (g/kg/day)	37.8 (6.1; 69.5)	0.019
Valine (µmol/L)	− 8.6 (− 12.3; − 4.8)	< 0.001
Isoleucine (µmol/L)	− 5.2 (− 12; 1.5)	0.128
Leucine (µmol/L)	5.6 (2.2; 9.1)	0.001
Valine/Leucine	− 771.5 (− 987.4; − 555.5)	< 0.001
Isoleucine/Leucine	− 431 (− 788.6; − 73.3)	0.018