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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.
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