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.

Sokka et al. Arthritis Research & Therapy 2010 12:R42   doi:10.1186/ar2951