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Table 3 Simple correlations and multiple regression multiple regression analyses mapping NDI data to EQ-5D

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 -0.0026 0.0004 NA NA
Pain intensity item
 Intercept 0.5587 <0.0001 NA NA
 Score -0.0115 0.0651 NA NA
Personal care item
 Intercept 0.5963 <0.0001 NA NA
 Score -0.0362 0.0087 NA NA
Lifting item
 Intercept 0.5591 <0.0001 NA NA
 Score -0.0154 0.0198 NA NA
Reading item
 Intercept 0.5727 <0.0001 NA NA
 Score -0.0176 0.0116 NA NA
Headaches item
 Intercept 0.5488 <0.0001 NA NA
 Score -0.0113 0.021 NA NA
Concentration item
 Intercept 0.5663 <0.0001 NA NA
 Score -0.0162 0.0013 NA NA
Work item
 Intercept 0.5797 <0.0001 NA NA
 Score -0.0222 <0.0001 NA NA
Driving item
 Intercept 0.565 <0.0001 NA NA
 Score -0.0156 0.0022 NA NA
Sleeping item
 Intercept 0.5342 <0.0001 NA NA
 Score -0.006 0.3195 NA NA
Recreation item
 Intercept 0.5957 <0.0001 NA NA
 Score -0.0238 <0.0001 NA NA
All items in one model
 Intercept 0.5827 <0.0001 0.5957 <0.0001
 Pain intensity 0.0256 0.0146 -0.0315 0.2414
 Personal care (Washing, Dressing, etc.)a -0.021 0.1007 NS NS
 Lifting 0.0014 0.8741 NS NS
 Reading -0.0009 0.9314 NS NS
 Headaches -0.0013 0.8623 NS NS
 Concentration -0.0102 0.3431 NS NS
 Work -0.0113 0.3347 NS NS
 Driving 0.0049 0.5255 NS NS
 Sleepinga 0.021 0.0064 0.023 0.4514
 Recreation -0.0348 0.0008 -0.0238 <0.0001
  1. NS not significant, NA not applicable
  2. aThe item would be removed in the final trimmed model due to no significance