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Table 4 Regression analyses to identify work disability status in 5,493 individuals younger than 65 years in the QUEST-RA study in 32 countries with a high (>24K USD) or low (<11K USD) GDP

From: Work disability remains a major problem in rheumatoid arthritis in the 2000s: data from 32 countries in the QUEST-RA Study

Type of country Onset of RA Sex, male Age Education lowest 2/3 RF-positive, ever Erosion-positive, ever HAQ ESR SJC28 Constant
All countries   1.46
(1.26-1.68)
0.99
(0.99-1.0)
1.36
(1.21-1.54)
1.10
(0.96-1.26)
1.74
(1.53-1.96)
2.76
(2.53-3.01)
1.00
(0.99-1.00)
0.99
(0.98-1.00)
0.13
Low-GDP Pre-2000 2.04
(1.38-3.02)
0.98
(0.97-0.99)
1.22
(0.95-1.58)
1.52
(1.12-2.08)
1.97
(1.40-2.76)
2.65
(2.19-3.19)
1.00
(0.99-1.00)
0.98
(0.96-1.01)
0.32
  Post-2000 1.26
(0.92-1.74)
1.00
(0.99-1.01)
1.65
(1.27-2.14)
1.07
(0.82-1.42)
2.10
(1.64-2.69)
2.33
(1.93-2.81)
1.00
(0.99-1.01)
0.98
(0.95-1.00)
0.07
High-GDP Pre-2000 1.41
(1.10-1.79)
0.99
(0.98-1.00)
1.40
(1.13-1.73)
0.89
(0.70-1.14)
1.12
(0.89-1.42)
2.94
(2.52-3.43)
1.00
(0.99-1.01)
1.00
(0.98-1.02)
0.25
  Post-2000 1.71
(1.29-2.26)
0.99
(0.98-1.00)
1.43
(1.09-1.87)
0.99
(0.75-1.30)
1.16
(0.90-1.50)
2.89
(2.36-3.54)
1.00
(0.99-1.01)
1.02
(0.99-1.05)
0.15
  1. Odds ratios (95% confidence intervals) are presented. ESR, erythrocyte sedimentation rate; GDP, gross domestic product; HAQ, Health Assessment Questionnaire; QUEST-RA, Quantitative Standard Monitoring of Patients with Rheumatoid Arthritis; RA, rheumatoid arthritis; RF, rheumatoid factor; SJC28, swollen joint count using 28 joints; USD, US dollars.