From: A study of the factors associated with cervical spinal disc degeneration, with a focus on bone metabolism and amino acids, in the Japanese population: a cross sectional study
Age
parameters
ρ
P value
Under 60 years
0.668
< 0.001
NTX
−0.380
Isoleucine
−0.352
0.001
Tryptophan
−0.252
0.017
Valine
−0.255
0.033
Leucine
−0.303
0.004
Over 60 years
25(OH) D3
−0.302