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Table 2 Associations between subgroups and outcomes

From: In a secondary care setting, differences between neck pain subgroups classified using the Quebec task force classification system were typically small – a longitudinal study

Outcome

Pain intensity*,1

Activity limitation*,2

 

(0 to 10 scale)

(0 to 100 scale)

 

Beta-coefficients

Beta-coefficients

 

(95%CI)

(95%CI)

Subgroup effect at baseline

  

Local NP [reference]

  

NP pain above the elbow

.5 (−.03 – 1.0)

3.1 (.9 - 5.3)

NP + pain below the elbow

1.0 (.5 - 1.5)

3.7 (1.6 - 5.8)

NP + NRI

1.3 (.8 - 1.7)

5.5 (3.5 - 7.4)

 

p < .001

p < .001

Time

  

3 months

- .6 (−1.2 - .06)

−1.9 (−3.7 - .2)

6 months

- .7 (−1.4 - .06)

−3.4 (−5.1 - -1.1)

12 months

−1.1 (−1.7 - -.5)

−3.3 (−5.2 - -1.4)

 

p < .001

p < .001

Subgroup X time

  

3-months

  

Local NP [reference]

  

NP + pain above the elbow

-.3 (−1.1 - .5)

-.5 (−3.0 - 1.9)

NP + pain below the elbow

-.3 (−1.1 - .4)

-.1 (−2.8 - 2.0)

NP + NRI

-.4(−1.0 - .4)

-.8 (−3.2 - 1.2)

 

p = .8

p = .8

6-months

  

Local NP [reference]

  

NP + pain above the elbow

.4 (−.4 - 1.3)

.8 (−1.7 - 3.4)

NP + pain below the elbow

-.4 (−1.2 - .4)

-.2 (−2.6 – 2.2)

NP + NRI

-.8 (−1.5 - .03)

−1.1 (−3.3 - .1.1)

 

p < .001

p = .2

12-months

  

Local NP [reference]

  

NP + pain above the elbow

.5 (−.3 - 1.2)

.4 (−2.0 - 2.7)

NP + pain below the elbow

-.1 (−.8 - .6)

.7 (−1.5 - 2.9)

NP + NRI

-.2 (−.9 - .4)

-.6 (−2.7 - 1.5)

 

p = .09

p = .3

  1. Longitudinal models used for pain intensity and activity limitation
  2. 1Higher of either average neck pain or average arm pain (n = 1693, average number of observations = 1.6)
  3. 2 N = 1832, average number of observations = 1.7
  4. ‘Reference’ indicates the classification category used as the reference in the regression model