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Table 2 Odds ratio (OR) and 95% confidence intervals (CI) for individuals and professional factors associated with Work Ability Index – WAI (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*     0.01    
  Female 702 (20.5) 1      
  Male 1745 (18.5) 0.88 [0.80-0.97]     
Age     <0.001   <0.001
  [40–45] 760 (13.9) 1    1   
  [45–50] 687 (17.8) 1.34 [1.20-1.50]   1.27 [1.11-1.15]  
  [50–55] 637 (27.6) 2.36 [2.10-2.66]   2.08 [1.81-2.40]  
  [55–60] 320 (31.7) 2.88 [2.47-3.36]   2.82 [2.35-3.38]  
  [60–65] 43 (21.9) 1.74 [1.23-2.46]   2.68 [1.81-3.96]  
BMI     <0.001    0.08
  Normal 752 (17.0) 1    1   
  Underweight 23 (19.3) 1.17 [0.74-1.86]   1.02 [0.55-1.86]  
  Overweight 991 (19.0) 1.15 [1.03-1.27]   1.06 [0.94-1.20]  
  Obesity 681 (22.1) 1.39 [1.24-1.56]   1.20 [1.04-1.38]  
Daily smoking habits     <0.001    
  Non-smoker 1670 (18.1) 1      
  Former smoker 133 (24.7) 1.49 [1.21-1.82]     
  From 1 to 10 cigarettes 131 (17.4) 0.95 [0.78-1.16]     
  From 11 to 20 cigarettes 209 (19.8) 1.12 [0.95-1.32]     
  From 21 to 30 cigarettes 186 (22.2) 1.29 [1.09-1.54]     
  > 30 cigarettes 118 (27.0) 1.67 [1.34-2.08]     
Health status        
  Number of diseases   1.27 [1.25-1.29] <0.001 1.13 [1.11-1.15] <0.001
  FICD / Yes 185 (41.6) 3.19 [2.63-3.87] <0.001 1.43 [1.11-1.84] 0.01
  MSD / Yes 1603 (32.6) 4.06 [3.70-4.46] <0.001 2.39 [2.12-2.70] <0.001
  Mental diseases / Yes 612 (46.5) 4.58 [4.07-5.16] <0.001 2.54 [2.18-2.96] <0.001
Type of work function     <0.001    <0.001
  Mixed 1036 (17.8) 1    1   
  Physical 1121 (26.6) 1.68 [1.52-1.85]   1.67 [1.49-1.87]  
  Mental 290 (10.3) 0.53 [0.46-0.61]   0.71 [0.61-0.84]  
Firm size     <0.001    0.03
  1-9 290 (14.7) 0.56 [0.47-0.66]   0.76 [0.63-0.91]  
  10-49 672 (17.4) 0.68 [0.59-0.78]   0.84 [0.72-0.98]  
  50-249 722 (18.6) 0.74 [0.64-0.84]   0.87 [0.74-1.01]  
  >=250 426 (23.7) 1    1   
  1. * Taken into account in the multivariable analysis but not part of the equation following Wald’s step-by-step descending method (the variable effect is not high enough to be kept in the model).
  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 WAI is significantly higher in the other age categories.