Skip to main content

Advertisement

Table 2 Low back symptoms and disability scores at baseline, 3 months, 6 months and 12 months according to treatment group, within group differences and between group comparisons of difference from baseline to 12 months

From: Correction of leg-length discrepancy among meat cutters with low back pain: a randomized controlled trial

Outcome measure Mean (SD) crude scores Difference between baseline and 12 months (95% CI) repeated measures regression1 Treatment difference (95% CI) repeated measures regression1
  Intervention Control Intervention Control
Intensity of LBP during last week
 Baseline 4.9 (1.5) 4.0 (1.5)    
 3 months 3.8 (1.9) 3.4 (1.7)    
 6 months 2.0 (1.1) 3.0 (1.9)    
 12 months 1.6 (0.9) 3.1 (2.1) − 3.3 (− 4.3 to − 2.3) −0.8 (− 1.9 to 0.4) −2.6 (− 3.7 to − 1.4)
Intensity of sciatica during last week
 Baseline 3.2 (1.9) 2.0 (2.0)    
 3 months 2.6 (2.1) 1.7 (2.0)    
 6 months 1.3 (1.0) 1.7 (1.8)    
 12 months 0.8 (1.0) 1.9 (2.0) −2.3 (− 4.4 to − 1.3) −0.1 (− 1.4 to 1.2) − 2.3 (− 3.4 to − 1.1)
Disability (Roland-Morris Disability Questionnaire)
 Baseline 5.8 (3.2) 5.0 (4.0)    
 3 months 4.0 (3.6) 3.3 (1.9)    
 6 months 3.6 (3.6) 3.7 (2.8)    
 12 months 3.4 (3.3) 3.2 (2.3) −1.9 (−3.1 to − 0.7) − 1.4 (−2.5. to − 0.3) −0.5 (− 1.3 to 0.3)
Oswestry Disability Index (NB)
 Baseline 18.2 (9.0) 12.2 (11.4)    
 3 months 14.5 (7.3) 13.3 (9.1)    
 6 months 13.2 (7.7) 11.8 (8.8)    
 12 months 13.3 (9.3) 11.0 (9.8) −4.8 (−8.1 to − 1.5) −1.2 (−3.6 to 1.2) −3.5 (−7.6 to 0.5)
Days on sick leave due to LBP during the past year
 Baseline 10.1 (10.2) 7.0 (15.7) −7.0 (−11.3 to − 2.6) 2 − 5.0 (− 11.5 to 1.5)2 1.9 (− 5.5 to 9.3)2
 12 months 2.4 (4.1) 6.2 (10.3)
−52.9 (− 8.6 to − 97.2) 3 27.4 (− 15.7 to 70.4)3 − 80.3 (− 146.1 to − 14.5) 3
  1. LLD leg length discrepancy, LBP low back pain, NB negative binomial model, 95% CI 95% confidence interval. Bold denotes significance
  2. 1Adjusted by age, BMI, gender and smoking. Hurdle model produces two kinds of estimates for difference between the baseline and 12 months and for the treatment difference:
  3. 2is the count part, the number of days on sick leave due to LBP and
  4. 3is the probability part for the likelihood of the sickness absence due to LBP