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Table 7 Simple correlations and multiple regression multiple regression analyses mapping NDI data to EQ-5D with Tobit 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 0.5926677 <0.0001 NA NA
Total score -0.0025993 0.000184 NA NA
Pain intensity item
Intercept 0.558685 <0.0001 NA NA
Score -0.011534 0.0589 NA NA
Personal care item
Intercept 0.596304 <0.0001 NA NA
Score -0.036187 <0.0001 NA NA
Lifting item
Intercept 0.559125 <0.0001 NA NA
Score -0.015351 0.0164 NA NA
Reading item
Intercept 0.572718 <0.0001 NA NA
Score -0.01755 0.00914 NA NA
Headaches item
Intercept 0.548824 <0.0001 NA NA
Score -0.011296 0.0175 NA NA
Concentration item
Intercept 0.56632 <0.0001 NA NA
Score -0.01617 0.000813 NA NA
Work item
Intercept 0.57973 <0.0001 NA NA
Score -0.022237 <0.0001 NA NA
Driving item
Intercept 0.56498 <0.0001 NA NA
Score -0.015599 0.0014 NA NA
Sleeping item
Intercept 0.534168 <0.0001 NA NA
Score -0.005999 0.311 NA NA
Recreation item
Intercept 0.59572 <0.0001 NA NA
Score -0.02382 <0.0001 NA NA
All items in one model
Intercept 0.5827 <0.0001 0.575353 <0.0001
Pain intensitya 0.0256 0.007693919 0.009556 0.18758
Personal care (Washing, Dressing, etc.) -0.0210 0.076227642 NS NS
Lifting 0.0014 0.865308708 NS NS
Reading -0.0009 0.926560041 NS NS
Headaches -0.0013 0.852636711 NS NS
Concentration -0.0102 0.30862753 NS NS
Work -0.0113 0.30016401 NS NS
Driving 0.0049 0.496119248 NS NS
Sleeping 0.0214 0.002766939 0.021422 0.00281
Recreation -0.0448 0.000189112 -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