Fig. 4

Fatty infiltration of paraspinal muscles among Pfirrmann grades (post hoc analysis with Bonferroni correction). A Multifidus The fatty infiltration was significantly increased with an increase in Pfirrmann grades, but Pfirrmann II vs Pfirrmann I、III are not statistically significant. ^*P-value < 0.05 ns: no significance. B Erector spinae Pfirrmann I vs Pfirrmann III、IV、V ^**P value < 0.01. Pfirrmann II vs Pfirrmann V ^&P value < 0.05. C Psoas Pfirrmann I vs Pfirrmann III、IV、V. ^*Adjust P-value < 0.05 (non-normally distributed data)