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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