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Table 1 Description of the sample and of the prevalence of working patients with rheumatoid arthritis in Blumenau, Santa Catarina state, Brazil, according to the independent variables, 2014

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

Variables Sample Working Patients
  n * % Prevalence (%) 95% CI p
Total 185 100.0 44.3 (37.0-51.5)  
Sex (n = 185)     0.943**
 Male 32 17.3 43.7 (25.5-61.9)  
 Female 153 82.7 44.4 (36.4-52.4)  
Age in years (n = 185)     0.025***
 20-59 (adults) 133 71.9 48.8 (40.2-57.4)  
  ≥ 60 (elderly) 52 28.1 32.6 (19.5-45.8)  
Income in minimum wages (n = 154)     0.001***
 0-2 117 75.9 34.1 (25.5-42.9)  
  > 2 37 24.1 64.8 (48.2-81.0)  
Education in completed years (n = 176)     0.000***
 0-4 60 34.1 25.0 (13.7-36.2)  
  > 4 116 65.9 54.3 (45.1-63.5)  
Self-reported skin color (n = 178)     0.686**
 White 165 92.7 44.2 (36.5-51.9)  
 Brown and black 13 7.3 38.4 (7.8-69.0)  
Presence of comorbidities (n = 181)     0.016**
 No 87 48.1 52.8 (42.1-63.5)  
 Yes 94 51.9 35.1 (25.2-44.9)  
Consultation with another rheumatologist (n = 181)     0.900**
 No 50 27.6 44.0 (29.7-58.2)  
 Yes 131 72.4 45.0 (36.4-53.6)  
Number of visits in the last 12 months (n = 176)     0.111***
 0-2 74 42.1 51.3 (39.6-63.0)  
  ≥ 3 102 57.9 39.2 (29.5-48.8)  
Type of medical care (n = 163)     0.637**
 SUS 72 44.1 40.2 (28.6-51.8)  
 Private and Public-Private Partnership 91 55.9 43.9 (33.5-54.3)  
Diagnostic delay in months (n = 178)     0.982***
 0-3 46 25.9 45.6 (30.6-60.6)  
  ≥ 4 132 74.1 45.4 (36.8-54.0)  
Disease time in months (n = 185)     0.681***
 0-24 20 10.9 4.0 (16.4-63.5)  
  ≥ 25 165 89.1 44.8 (37.1-52.5)  
Current use of DMARDs (n = 168)     0.724**
 No 46 27.3 45.6 (30.6-60.6)  
 Yes 122 72.7 42.6 (33.7-51.5)  
Current use of biologicals (anti-TNF) (n = 172)     0.162**
 No 116 67.4 42.2 (33.1-51.3)  
 Yes 56 32.6 53.5 (40.0-67.0)  
HAQ score (n = 110)     0.009***
 0-1 45 41.0 62.2 (47.4-76.9)  
 1.1-3 65 59.0 36.9 (24.8-48.9)  
Rheumatoid factor (n = 160)     0.873**
 0-60 (normal or low titer) 90 56.2 45.4 (35.0-56.0)  
  ≥ 61 (high titers) 70 43.8 44.2 (32.3-56.2)  
Radiography of hands with joint erosion (n = 151)     0.375**
 No 62 41.0 50.0 (37.1-62.8)  
 Yes 89 59.0 42.6 (32.2-53.1)  
  1. 95% CI 95% confidence interval
  2. *Number of working patients with rheumatoid arthritis who were on sick leave or were disability retirees
  3. **Chi-squared test
  4. ***Wald test