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Table 1 The original and the new study groups.

From: Subgroup analyses on return to work in sick-listed employees with low back pain in a randomised trial comparing brief and multidisciplinary intervention

  RTW no RTW
  Original study New study Original study New study
  % n % n % n % n
Socio-demographics:         
Gender (% men) 49 258 42 83 44 93 41 37
Age (years, mean(SD)) 41.4 (10.7) 258 40.5 (10.0) 83 43.6 (9.6) 93 41.3 (10.0) 37
Marital status (% single) 23 253 18 83 28 92 15 37
Children (% yes) 76 253 71 83 85 93 81 37
Education (%):   251   78   93   37
   None 17   17   17   19  
   Brief courses 12   9   16   16  
   Skilled/trained 36   28   32   38  
   < 3 years 12   13   13   5  
   3-4 years 15   26   12   16  
   > 4 years 3   4   2   3  
   Other 5   4   8   3  
Work-related factors:         
Public employee (% yes) 41 246 44 78 43 89 27 37
High work pace (%):   253   83   93   37
   Often 47   48   55   65  
   Some times 47   43   37   30  
   Seldom 5   8   8   3  
   Never/hardly ever 1   0   1   3  
Support from colleagues (%):   250   81   93   37
   Often 28   32   14   14  
   Some times 52   52   56   49  
   Seldom 16   12   19   22  
   Never/hardly ever 4   4   11   16  
Colleagues willing to listen to work-related problems (%):   250   80   93   36
   Often 49   53   38   44  
   Some times 40   36   48   36  
   Seldom 9   10   9   11  
   Never/hardly ever 2   1   5   8  
Support from superior (%):   247   81   92   36
   Often 29   38   28   22  
   Some times 43   36   41   47  
   Seldom 21   21   22   17  
   Never/hardly ever 7   5   9   14  
Superior willing to listen to work-related problems (%):   246   81   92   37
   Often 45   49   41   41  
   Some times 38   31   30   30  
   Seldom 11   17   21   13  
   Never/hardly ever 6   2   8   16  
Job satisfaction, everything taken into consideration (%):   249   83   91   35
   Very satisfied 46   47   40   29  
   More or less satisfied 47   45   44   49  
   Rather dissatisfied 6   7   12   20  
   Very dissatisfied 1   1   4   3  
Influence on work planning (% yes) 80 251 79 82 67 90 43 35
Shift work (% yes) 21 251 27 82 29 90 25 36
Interested in returning to current job (% yes) 88 249 91 79 84 86 83 35
Health and work-related factors:         
Feeling at risk of losing job because of current sick leave (% yes) 35 246 27 81 49 86 34 35
Concerned about losing job because of medical condition (% yes) 52 252 41 82 60 90 46 35
This incidence of LBP is caused by my work (% yes) 55 250 60 83 61 90 75 36
Work ability, all in all (%)   251   80   92   35
   Excellent 9   11   9   3  
   Good 25   35   14   17  
   Fairly good 27   18   26   34  
   Fairly bad 27   22   23   23  
   Very bad 12   14   28   23  
Permanently impaired work ability (% yes) 61 233 51   77 88 82 34
Claim of compensation due to health problems has been forwarded (% yes) 21 258 21 83 33 93 38 37
Chances of being back at work in 6 months (scale 0-10, mean(SD)) 8.0 (2.6) 227 8.5 (2.0) 83 6.5 (3.1) 87 6.5 (2.9) 35
Work ability in a year (%):   250   82   89   35
   Much better 34   43   28   14  
   Fairly better 37   32   30   43  
   More or less the same 26   25   34   40  
   Fairly worse 3   0   8   3  
   Much worse 1   0   0   0  
Incapacity benefit is desirable (%):   234   79   86   31
   Absolutely not 91   96   77   77  
   Maybe 8   4   16   16  
   Absolutely 1   0   7   7  
  1. Baseline characteristics of participants who returned to work (RTW) during the first 12 months and participants still sick-listed (no RTW) with low back pain after 12 months.