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Research ArticleArticle

Socioeconomic and Occupational Risk Factors for Rheumatoid Arthritis: A Nationwide Study Based on Hospitalizations in Sweden

XINJUN LI, JAN SUNDQUIST and KRISTINA SUNDQUIST
The Journal of Rheumatology June 2008, 35 (6) 986-991;
XINJUN LI
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  • For correspondence: xinjun.li@ki.se
JAN SUNDQUIST
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KRISTINA SUNDQUIST
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Abstract

Objective

To investigate possible associations between socioeconomic status, occupation, and hospitalization for rheumatoid arthritis (RA).

Methods

A nationwide database was constructed by linking the Swedish Census to the Hospital Discharge Register in order to obtain data on all first hospitalizations for RA in Sweden during the study period 1964 to 2004. Standardized incidence ratios (SIR) and 95% confidence intervals were calculated by socioeconomic status (education level) and occupation for men and women aged 30 years and older. Three cohorts were defined based on occupational titles recorded in Swedish census data in 1960, 1970, and 1980.

Results

A total of 13,820 male and 14,509 female hospitalizations for RA were identified during the study period. Men and women with an education level > 12 years had significantly decreased SIR. Among men, significantly increased SIR were present in all 3 cohorts among farmers, miners and quarry workers, electrical workers, other construction workers, and engine and motor operators. Among women, assistant nurses and religious, juridical, and other social-science-related workers had significantly increased SIR in all 3 cohorts.

Conclusion

Socioeconomic status and occupation sometimes carry a significantly increased risk of hospitalization for RA. Future studies could investigate specific agents in the occupations for which increased risks are identified.

Key Indexing Terms:
  • SOCIOECONOMIC STATUS
  • OCCUPATION
  • FOLLOWUP STUDY
  • STANDARDIZED INCIDENCE RATIOS
  • RHEUMATOID ARTHRITIS

Footnotes

  • X. Li, MD, MPH, PhD; J. Sundquist, MD, PhD; K. Sundquist, MD, PhD.

  • Supported by the National Institutes of Health (grant no. R01-H271084-1), the Swedish Research Council (grant no. K2004-21X-11651-09A to Dr. J. Sundquist and K2005-27X-15428-01A to Dr. K. Sundquist), and the Swedish Council for Working Life and Social Research (grant no. 2001-2373).

    • Accepted for publication January 10, 2008.
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The Journal of Rheumatology
Vol. 35, Issue 6
1 Jun 2008
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Socioeconomic and Occupational Risk Factors for Rheumatoid Arthritis: A Nationwide Study Based on Hospitalizations in Sweden
XINJUN LI, JAN SUNDQUIST, KRISTINA SUNDQUIST
The Journal of Rheumatology Jun 2008, 35 (6) 986-991;

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Socioeconomic and Occupational Risk Factors for Rheumatoid Arthritis: A Nationwide Study Based on Hospitalizations in Sweden
XINJUN LI, JAN SUNDQUIST, KRISTINA SUNDQUIST
The Journal of Rheumatology Jun 2008, 35 (6) 986-991;
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