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. 2013 Aug;40(8):1334-6.
doi: 10.3899/jrheum.121215. Epub 2013 Jun 15.

Observation period effects on estimation of systemic lupus erythematosus incidence and prevalence in Quebec

Ryan Ng  1 , Sasha Bernatsky, Elham Rahme
Affiliations

Observation period effects on estimation of systemic lupus erythematosus incidence and prevalence in Quebec

Ryan Ng et al. J Rheumatol. 2013 Aug.

Abstract

Objective: To determine how duration of observation affects estimation of incidence and prevalence of systemic lupus erythematosus (SLE).

Methods: SLE incidence and prevalence estimates from data periods as brief as 3 years (2001-2003) were compared to estimates from a 15-year period (1989-2003).

Results: The 15-year period incidence was 5.6/100,000 (95% CI 5.0-6.1) and the prevalence was 59.1/100,000 (95% CI 57.4-60.8). When a 3-year period was used, incidence was overestimated by 238.1% and prevalence underestimated by 66.0%.

Conclusion: SLE incidence and prevalence estimates vary considerably according to the observation period; more than 5 years of data is likely required.

Keywords: INCIDENCE; PREVALENCE; SYSTEMIC LUPUS ERYTHEMATOSUS.

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