The impact of rural residency on the expression and outcome of systemic lupus erythematosus: data from a multiethnic Latin American cohort

Lupus. 2012 Nov;21(13):1397-404. doi: 10.1177/0961203312458465. Epub 2012 Aug 31.

Abstract

Objective: The objective of this paper is to examine the role of place of residency in the expression and outcomes of systemic lupus erythematosus (SLE) in a multi-ethnic Latin American cohort.

Patients and methods: SLE patients (< two years of diagnosis) from 34 centers constitute this cohort. Residency was dichotomized into rural and urban, cut-off: 10,000 inhabitants. Socio-demographic, clinical/laboratory and mortality rates were compared between them using descriptive tests. The influence of place of residency on disease activity at diagnosis and renal disease was examined by multivariable regression analyses.

Results: Of 1426 patients, 122 (8.6%) were rural residents. Their median ages (onset, diagnosis) were 23.5 and 25.5 years; 85 (69.7%) patients were Mestizos, 28 (22.9%) Caucasians and 9 (7.4%) were African-Latin Americans. Rural residents were more frequently younger at diagnosis, Mestizo and uninsured; they also had fewer years of education and lower socioeconomic status, exhibited hypertension and renal disease more frequently, and had higher levels of disease activity at diagnosis; they used methotrexate, cyclophosphamide pulses and hemodialysis more frequently than urban patients. Disease activity over time, renal damage, overall damage and the proportion of deceased patients were comparable in rural and urban patients. In multivariable analyses, rural residency was associated with high levels of disease activity at diagnosis (OR 1.65, 95% CI 1.06-2.57) and renal disease occurrence (OR 1.77, 95% CI 1.00-3.11).

Conclusions: Rural residency associates with Mestizo ethnicity, lower socioeconomic status and renal disease occurrence. It also plays a role in disease activity at diagnosis and kidney involvement but not on the other end-points examined.

Publication types

  • Comparative Study
  • Multicenter Study
  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adult
  • African Continental Ancestry Group / statistics & numerical data
  • Age Factors
  • American Native Continental Ancestry Group / statistics & numerical data
  • Chi-Square Distribution
  • Comorbidity
  • Continental Population Groups / statistics & numerical data*
  • Cyclophosphamide / therapeutic use
  • Disease Progression
  • Educational Status
  • European Continental Ancestry Group
  • Female
  • Health Services Accessibility / statistics & numerical data
  • Healthcare Disparities / ethnology
  • Humans
  • Hypertension / ethnology
  • Immunosuppressive Agents / therapeutic use
  • Latin America / epidemiology
  • Logistic Models
  • Longitudinal Studies
  • Lupus Erythematosus, Systemic / diagnosis
  • Lupus Erythematosus, Systemic / ethnology*
  • Lupus Erythematosus, Systemic / therapy
  • Lupus Nephritis / ethnology
  • Male
  • Medically Uninsured / ethnology
  • Methotrexate / therapeutic use
  • Multivariate Analysis
  • Odds Ratio
  • Prognosis
  • Renal Dialysis
  • Residence Characteristics / statistics & numerical data*
  • Risk Factors
  • Rural Health / statistics & numerical data*
  • Socioeconomic Factors
  • Time Factors
  • Urban Health / statistics & numerical data*
  • Young Adult

Substances

  • Immunosuppressive Agents
  • Cyclophosphamide
  • Methotrexate