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Table 2 Mean raw Change Score (0 – 100 scale) and standardised response mean (SRMraw) in primary and secondary sector patients according to pain location.

From: Responsiveness and minimal clinically important difference for pain and disability instruments in low back pain patients

Instrument Primary Sector Patients Secondary Sector Patients
  n Mean raw change (SD) SRMraw (95% CI) n Mean raw change (SD) SRMraw (95% CI)
LBP only       
   ODI 69 18.5 (16.8) 1.1 (0,8; 1,4) 28 3.0 (11.7) 0.3 (-0,1; 0,6)
   RMQ 69 27.7 (19.4) 1.4* (1,2; 1,7) 28 7.5 (15.7) 0.5 (0,2; 0,8)
   LBPRSdisability 67 15.4 (22.5) 0.7 (0,3; 1,0) 28 2.7 (18.6) 0.1 (-0,2; 0,5)
   SF36 (pf) 70 23.6 (24.4) 1.0 (0,8; 1,2) 28 5.6 (16.9) 0.3 (0,0; 0,7)
   LBPRSpain 68 18.7 (20.8) 0.9 (0,5; 1,3) 27 2.1 (16.1) 0.1 (-0,3; 0,5)
   SF36 (bp) 70 40.2 (28.6) 1.4* (1,0; 1,8) 28 10.8 (17.1) 0.6* (0,2; 1,0)
   NRSpain 69 26.2 (23.4) 1.1 (0,8; 1,5) 26 1.4 (18.1) 0.1 (-0,3; 0,5)
Leg pain (+/- LBP)       
   ODI 24 12.0 (13.5) 0.9 (0,5; 1,2) 69 3.5 (9.5) 0.4 (0,1; 0,6)
   RMQ 24 18.8 (22.0) 0.9 (0,5; 1,2) 68 3.6 (12.1) 0.3 (0,1; 0,5)
   LBPRSdisability 24 10.8 (17.9) 0.6 (0,2; 1,0) 69 4.5 (10.6) 0.4 (0,2; 0,7)
   SF36 (pf) 24 15.5 (24.0) 0.6 (0,3; 1,0) 69 5.1 (15.4) 0.3 (0,1; 0,6)
   LBPRSpain 24 23.5 (25.7) 0.9 (0,5; 1,3) 66 7.8 (15.7) 0.5 (0,2; 0,8)
   SF36 (bp) 24 28.4 (26.4) 1.1 (0,6; 1,5) 69 12.3 (18.0) 0.7* (0,4; 1,0)
   NRSpain 23 25.7 (30.4) 0.8 (0,4; 1,2) 65 7.8 (22.7) 0.3 (0,1; 0,6)
  1. ODI = Oswestry Disability Index; RMQ =Roland Morris Disability Questionnaire; LBPRSdisability =Disability subscale of the Low Back Pain Rating Scale; SF36 (pf) =Physical function subscale of the SF36; LBPRSpain = Painsubscale of the Low Back Pain Rating Scale; SF36 (bp) = Bodily painsubscale of the SF36; NRSpain = Numeric 11-box pain rating scale; SRMraw = standardised response mean of the raw change score.
  2. Note: Results are shown according to where in the health care system the patients were seen and whether or not they complained of LBP or leg pain and/or LBP. The 95% CIs for the SRMraw were calculated using a bootstrap technique.
  3. * Significantly larger SRMraw when compared to the rest of the disability/pain instruments.