Table 2

Results of the mixed linear model fit.

VariableEstimatea SEa P a
Fixed effects   
 Interceptb 44.06.5<0.0001
 Interval (day)-0.00050.0110.97
 Sex (male)-8.12.90.007
 Age0.180.450.32
 Concomitant diseases (yes or NA)0.350.340.96
 BMI0.680.340.05
Random effects   
 Patientσ = 12.8  
 Residualσ = 8.3  
Fit quality   
 R2 mar /R2 con c 0.09/0.73  

  • Abbreviations: BMI, body mass index; NA, not applicable; ODI, Oswestry Disability Index.

  • ↵a For the fixed effects.

  • ↵b The intercept reflects the expected ODI score for a 70-year-old woman with no concomitant diseases and a BMI of 29.

  • ↵c Marginal R 2 value/conditional R 2 value.