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Table 2 Associations between subgroups and activity limitations (Roland Morris Disability Questionnaire 0–100) in longitudinal models (n = 1,745)

From: Prognostic implications of the Quebec Task Force classification of back-related leg pain: an analysis of longitudinal routine clinical data

  Beta-coefficients (95% CI) Beta-coefficients (95% CI) Beta-coefficients (95% CI)
Model I: Unadjusted association Model II: Adjusted for duration Model III: Adjusted for duration, age, gender, previous episodes, pain irritability, LBP intensity, leg pain intensity, depression, general health
Subgroup effect (at baseline)
Local LBP [reference]    
LBP + pain above knee 7.5 (2.8 – 12.2)* 8.0 (3.4 – 12.7)* 2.2 (−2.4 – 6.7)
LBP + pain below knee 9.3 (5.2 – 13.5)* 9.7 (5.6 – 13.8)* 3.4 (−0.9 – 7.8)
LBP + NRI 19.8 (16.2 – 23.3)*¤ § 21.0 (17.5 – 24.5)*¤§ 11.3 (7.1 – 15.4)*¤§
Subgroup X time (at 3 months)
Local LBP [reference]    
LBP + pain above knee −0.2 (−5.1 – 4.7) −0.2 (−5.1 – 4.7) 0.0 (−4.9 – 4.9)
LBP + pain below knee −0.3 (−4.6 – 4.0) −0.4 (−4.6 – 3.9) −0.2 (−4.5 – 4.1)
LBP + NRI −6.7 (−10.4 – -3.1)*¤ § −6.4 (−10.0 – -2.4)*¤§ −6.3 (−10.0 – -2.7)*¤§
Subgroup X time (at 12 months)
Local LBP [reference]    
LBP + pain above knee 2.1 (−2.9 – 7.1) 2.2 (−2.8 – 7.1) 2.2 (−2.7 – 7.2)
LBP + pain below knee −1.0 (−5.4 – 3.5) −0.9 (−5.3 – 3.5) −1.0 (−5.4 – 3.4)
LBP + NRI −6.3 (−10.1 – -2.5)*¤§ −6.2 (−10.0 – -2.4)*¤§ −6.3 (−10.0 – -2.5)*¤§
  1. Subgroup effect and Subgroup X Time effects: p < 0.001 in all Models I-III; *p < 0.05 in comparison with Local LBP; ¤ p < 0.05 in comparison with LBP + pain above knee; §p < 0.05 in comparison with LBP + pain below knee.