Skip to main content

Table 4 Standardised response mean (SRMraw) in relation to patients global important effect and according to patient entry point (primary and secondary sector patients) and pain location.

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

Instrument Important improvement No change Difference P
  n SRMraw (95% CI) n SRMraw (95% CI)   
Subpopulations       
Primary Sector Patients       
   ODI 63 1.4 (1.2; 1.7) 23 0.8 (0.4; 1.2) 0.6 0.05
   RMQ 63 1.7 (1.4; 2.0) 23 0.7 (0.3; 1.1) 1.0  
   LBPRSdisability 62 0.8 (0.4; 1.2) 22 0.5 (0.1; 0.9) 0.3  
   SF36 (pf) 64 1.1 (0.9; 1.3) 23 0.4 (0.0; 0.8) 0.7  
   LPBRSpain 62 1.4 (1.1; 1.6) 23 0.6 (0.1; 1.1) 0.8 0.08
   SF36 (bp) 64 2.1 (1.6; 2.5) 23 0.8 (0.4; 1.3) 1.2  
   NRSpain 62 1.5 (1.2; 1.8) 23 0.8 (0.3; 1.3) 0.7  
Secondary Sector Patients       
   ODI 19 1.0 (0.3; 1.7) 43 0.2 (-0.1; 0.5) 0.8 0.01
   RMQ 18 1.3 (0.7; 1.9) 43 0.3 (0.0; 0.6) 1.0  
   LBPRSdisability 19 0.8 (0.4; 1.3) 43 0.3 (0.0; 0.7) 0.5  
   SF36 (pf) 19 0.7 (0.3; 1.1) 43 0.4 (0.1; 0.7) 0.3  
   LPBRSpain 18 1.1 (0.3; 1.8) 42 0.2 (-0.1; 0.5) 0.9 0.06
   SF36 (bp) 19 2.1 (1.1; 3.0) 43 0.7 (0.3; 1.0) 1.4  
   NRSpain 18 0.9 (0.4; 1.3) 41 0.2 (-0.1; 0.5) 0.7  
LBP only patients       
   ODI 58 1.4 (1.1; 1.6) 21 0.7 (0.3; 1.1) 0.7 0.03
   RMQ 58 1.7 (1.4; 2.0) 21 0.7 (0.4; 1.0) 1.0  
   LBPRSdisability 57 0.8 (0.4; 1.3) 20 0.5 (0.2; 0.9) 0.3  
   SF36 (pf) 59 1.1 (0.9; 1.3) 21 0.7 (0.3; 1.0) 0.4  
   LPBRSpain 57 1.3 (1.0; 1.6) 21 0.5 (0.0; 1.0) 0.8 0.07
   SF36 (bp) 59 1.9 (1.5; 2.3) 21 0.9 (0.4; 1.4) 1.2  
   NRSpain 58 1.4 (1.1; 1.7) 21 0.7 (0.3; 1.1) 0.7  
Leg pain (+/- LBP)       
   ODI 24 1.2 (0.6; 1.7) 45 0.3 (0.0; 0.6) 0.9 0.05
   RMQ 23 1.3 (0.8; 1.7) 45 0.3 (0.0; 0.6) 1.0  
   LBPRSdisability 24 0.8 (0.3; 1.2) 45 0.3 (0.0; 0.7) 0.5  
   SF36 (pf) 24 0.8 (0.4; 1.2) 45 0.3 (0.0; 0.6) 0.5  
   LPBRSpain 23 1.3 (0.7; 1.9) 44 0.3 (0.0; 0.6) 1.0 0.46
   SF36 (bp) 24 2.0 (1.3; 2.6) 45 0.6 (0.3; 1.0) 1.1  
   NRSpain 22 1.3 (0.8; 1.8) 43 0.2 (-0.1; 0.5) 1.1  
  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 = Pain subscale of the Low Back Pain Rating Scale; SF36 (bp) = Bodily pain subscale 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 pain location. The 95% CIs for the SRMraw were calculated using a bootstrap technique. The P values refer to a comparison of the difference in SRMs between patients with an "important improvement" and patients with "no change" for the disability and pain instruments within each subpopulation (linear regression model with a non-linear Wald-type test).