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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.