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Table 2 Crude and adjusted Poisson regression analyses of the prevalence of working patients with rheumatoid arthritis as a function of independent variables in Blumenau, Santa Catarina state, Brazil, 2014

From: Staying in the labor force among patients with rheumatoid arthritis and associated factors in Southern Brazil

Variables Crude analysis Adjusted analysis
PRc (95% CI) p PRa (95% CI) p
Sex (n = 185)   0.943*   NS
 Male 0.98 (0.70-1.38)    
 Female 1    
Age in years (n = 185)   0.023   0.001
 20-59 (adults) 1.33 (1.04-1.71)   1.90 (1.31-2.75)  
  ≥ 60 (elderly) 1   1  
Income in minimum wages (n = 154)   0.007   0.008
 0-2 1.87 (1.18-2.96)   2.32 (1.24-4.36)  
  > 2 1   1  
Education in completed years (n = 176)   0.000   0.676**
 0-4 1.64 (1.28-2.10)   1.08 (0.74-1.58)  
  > 4 1   1  
Self-reported skin color (n = 178)   0.669*   NS
 White 1    
 Black + Brown 1.1 (0.70-1.73)    
Presence of comorbidities (n = 181)   0.019   0.464**
 No 1   1  
 Yes 1.37 (1.05-1.80)   1.08 (0.74-1.58)  
Consultation with another rheumatologist (n = 181)   0.900*   NS
 No 1    
 Yes 0.98 (0.73-1.31)    
Number of visits in the last 12 months (n = 176)   0.121   0.619**
 0-2 1.03 (0.99-1.08)   0.91 (0.65-1.28)  
  ≥ 3 1   1  
Type of medical care (n = 163)   0.637*   NS
 SUS 1.06 (0.81-1.38)    
 Private + Public-Private Partnership 1    
Diagnostic delay in months (n = 178)   0.982*   NS
 0-3 1    
  ≥ 4 1.01 (0.73-1.36)    
Disease time in months (n = 185)   0.667*   NS
 0-24 1    
  ≥ 25 0.91 (0.62-1.35)    
Current use of DMARDs (n = 168)   0.729*   NS
 No 0.94 (0.69-1.28)    
 Yes 1    
Current use of biologicals (n = 172)   0.184   0.481**
 No 1.24 (0.90-1.71)   1.17 (0.79-1.73)  
 Yes 1   1  
HAQ (n = 110)   0.017   0.017
 0-1 1   1  
 1.1-3 1.66 (1.09-2.54)   1.73 (1.10-2.72)  
Rheumatoid factor (n = 160)   0.873**   NS
 0-60 (normal or low titer) 1    
  ≥ 61 (high titers) 1.02 (0.77-1.35)    
Radiography of hands with joint erosion (n = 151)   0.385**   NS
 No 1    
 Yes 1.14 (0.84-1.55)    
  1. 95% CI 95% confidence interval, NS non-significant p value, PRc crude prevalence ratio, PRa adjusted prevalence ratio
  2. *Excluded from the adjusted analysis (p value > 0.20)
  3. **Excluded from the final model (p value > 0.05)