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

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

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

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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