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Table 6 Simple correlations and multiple regression multiple regression analyses mapping NDI data to EQ-5D with CLAD method

From: Mapping the neck disability index to SF-6D in patients with chronic neck pain

Predictors Full model Trimmed model
Estimate (β) p-value Estimate (β) p-value
Total score of 10 items
Intercept 0.5927 <0.0001 NA NA
Total score -0.002599 0.0003276 NA NA
Pain intensity item
Intercept 0.5587 <0.0001 NA NA
Score -0.01153 0.0622 NA NA
Personal care item
Intercept 0.5963 <0.0001 NA NA
Score -0.03619 <0.0001 NA NA
Lifting item
Intercept 0.5591 <0.0001 NA NA
Score -0.01535 0.01851 NA NA
Reading item
Intercept 0.5727 <0.0001 NA NA
Score -0.01755 0.0116 NA NA
Headaches item
Intercept 0.5727 <0.0001 NA NA
Score -0.01755 0.01074 NA NA
Concentration item
Intercept 0.5488 <0.0001 NA NA
Score -0.0113 0.01967 NA NA
Work item
Intercept 0.5663 <0.0001 NA NA
Score -0.01617 0.001198 NA NA
Driving item
Intercept 0.58 <0.0001 NA NA
Score -0.0222 0.00195 NA NA
Sleeping item
Intercept 0.534 <0.0001 NA NA
Score -0.006 0.314 NA NA
Recreation item
Intercept 0.5957 <0.0001 NA NA
Score -0.02382 <0.0001 NA NA
All items in one model
Intercept 0.5827 <0.0001 0.60176522 <0.0001
Pain intensity 0.0256 0.009326 0.01455149 0.04359
Personal care (Washing, Dressing, etc.) -0.0210 0.08008 -0.02685645 0.003282
Lifting 0.0014 0.8657 NS NS
Reading -0.0009 0.9268 NS NS
Headaches -0.0013 0.8531 NS NS
Concentration -0.0102 0.3117 NS NS
Work -0.0113 0.3033 NS NS
Driving 0.0049 0.4981 NS NS
Sleepinga 0.0210 0.003691 0.02037582 0.003771
Recreation -0.0348 0.0003551 -0.03972382 <0.0001
  1. NS not significant, NA not applicable
  2. aThe item would be removed in the final trimmed model due to no significance