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

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)