Table 2 Univariable and multivariable linear regression analyses for log₂ MMA

   Log₂ vitamin B12 (pmol/L)

− 0.424

< 0.001

− 0.434

< 0.001

1.131

0.08

    Log₂ eGFR (mL/min/1.73 m²)

− 0.189

< 0.001

− 0.162

< 0.001

0.689

0.048

    Log₂ vitamin B12 × log₂ eGFR

–

–

–

–

− 1.796

0.01

 Male sex

0.002

0.9

− 0.065

0.005

− 0.053

0.02

 Age (years)

0.093

< 0.001

0.050

0.04

0.034

0.2

 High education

− 0.099

< 0.001

–

–

− 0.030

0.2

 Use of vitamin supplements

− 0.069

0.007

–

–

–

–