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