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Table 3 Odds ratio (OR) and 95% confidence intervals (CI 95) for individual and professional factors associated with Work Ability score – WAS (moderate-poor) vs (excellent-good)

From: Work ability assessment in a worker population: comparison and determinants of Work Ability Index and Work Ability score

Variable N (%) Univariable analysis Multivariable analysis
   OR 95% CI P-value OR 95% CI P-value
Gender     0.99    
  Female 620 (18.1) 1      
  Male 1702 (18.1) 1 0.90 -1.11     
Age     < 0.0001    < 0.0001
  [40–45] 733 (13.4) 1    1   
  [45–50] 656 (17.0) 1.33 1.18-1.49   1.25 1.10-1.42  
  [50–55] 576 (25.0) 2.15 1.90-2.43   1.87 1.63-2.15  
  [55–60] 309 (30.6) 2.86 2.45-3.34   2.73 2.29-3.26  
  [60–65] 48 (24.5) 2.10 1.50-2.93   3.09 2.15-4.44  
BMI*     < 0.0001    
  Normal 721 (16.3) 1      
  Underweight 17 (14.3) 0.86 0.51-1.44     
  Overweight 972 (18.6) 1.18 1.06-1.31     
  Obesity 612 (19.9) 1.28 1.13-1.44     
Daily smoking habits     < 0.0001   0,06  
  Non-smoker 1611 (17.5) 1    1   
  Former smoker 110 (20.5) 1.21 0.98-1.51   1.27 0.97-1.66  
  From 1 to 10 cigarettes 112 (14.9) 0.83 0.67-1.02   1.30 0.92-1.85  
  From 11 to 20 cigarettes 219 (20.8) 1.24 1.06-1.45   0.99 0.70-1.40  
  From 21 to 30 cigarettes 167 (20.0) 1.18 0.99-1.41   1.47 1.08-2.00  
  > 30 cigarettes 103 (23.6) 1.46 1.16-1.83   1.19 0.86-1.65  
Health status        
  Number of diseases   1.18 1.16-1.19 < 0.0001 1.09 1.07-1.10 < 0.0001
  FICD / Yes 163 (36.6) 2.74 2.25-3.34 < 0.0001 1.45 1.14-1.85 0.003
  MSD / Yes 1380 (28.1) 2.89 2.64-3.17 < 0.0001 1.95 1.74-2.20 < 0.0001
  Mental diseases / Yes 501 (38.0) 3.27 2.90-3.70 < 0.0001 1.98 1.70-2.30 < 0.0001
Type of work function     < 0.0001    < 0.0001
  Mixed 960 (16.5) 1    1   
  Physical 1043 (24.8) 1.67 1.51-1.84   1.65 1.48-1.85  
  Mental 319 (11.4) 0.65 0.57-0.74   0.78 0.67-0.91  
Firm size*     < 0.0001    
  1-9 307 (15.6) 0.70 0.59-0.82     
  10-49 623 (16.1) 0.72 0.63-0.83     
  50-249 681 (17.2) 0.80 0.70-0.92     
  >=250 377 (21.0) 1      
  1. * Taken into account in the multivariable analysis but not part of the equation following Wald’s step-by-step descending method.
  2. To help to read the table, let us comment on one example: in the multivariable analysis, taking the age category [40–45] as a reference, the probability to obtain a poor to moderate WAS is significantly higher in the other age categories.