Stroke Incidence and Case Fatality According to Rural or Urban Residence

Results From the French Brest Stroke Registry

Olivier Grimaud, MD, PhD; Yacine Lachkhem, PhD; Fei Gao, PhD; Cindy Padilla, PhD; Mélanie Bertin, PhD; Emmanuel Nowak, PhD; Serge Timsit, MD, PhD

Disclosures

Stroke. 2019;50(10):2661-2667. 

In This Article

Abstract and Introduction

Abstract

Background and Purpose: Recent findings suggest that in the United States, stroke incidence is higher in rural than in urban areas. Similar analyses in other high-income countries are scarce with conflicting results. In 2008, the Brest Stroke Registry was started in western France, an area that includes about 366 000 individuals living in various urban and rural settings.

Methods: All new patients with stroke included in the Brest Stroke Registry from 2008 to 2013 were classified as residing in town centers, suburbs, isolated towns, or rural areas. Poisson regression was used to analyze stroke incidence and 30-day case fatality variations in the 4 different residence categories. Models with case fatality as outcome were adjusted for age, stroke type, and stroke severity.

Results: In total, 3854 incident stroke cases (n=2039 women, 53%) were identified during the study period. Demographic and socio-economic characteristics and primary healthcare access indicators were significantly different among the 4 residence categories. Patterns of risk factors, stroke type, and severity were comparable among residence categories in both sexes. Age-standardized stroke rates varied from 2.90 per thousand (95% CI, 2.59–3.21) in suburbs to 3.35 (95% CI, 2.98–3.73) in rural areas for men, and from 2.14 (95% CI, 2.00–2.28) in town centers to 2.34 (95% CI, 2.12–2.57) in suburbs for women. Regression models suggested that among men, stroke incidence was significantly lower in suburbs than in town centers (incidence rate ratio =0.87; 95% CI, 0.77–0.99). Case fatality risk was comparable across urban categories but lower in rural patients (relative risk versus town centers: 0.76; 95% CI, 0.60–0.96).

Conclusions: Stroke incidence was comparable, and the 30-day case fatality only slightly varied in the 4 residence categories despite widely different socio-demographic features covered by the Brest Stroke Registry.

Introduction

Urban-rural disparities in stroke epidemiology have received only modest attention. In 2008, Joubert et al[1] showed that contrasting urban-rural patterns exist in high-income countries. Specifically, stroke mortality rates were higher among rural than urban residents in the United States and in France,[2] but not in Canada.[3] Stroke mortality variations are mainly explained by stroke incidence and casefatality rates. Accordingly, a recent analysis of the REGARDS cohort study (Reasons for Geographic and Racial Differences in Stroke) demonstrated that the higher stroke mortality among rural residents in the United States could be attributed to its higher incidence.[4] In Europe, 3 studies compared stroke incidence in rural and urban areas in France (period 1989–1993),[5] Bulgaria (2000–2001),[6] and Portugal (1998–2000).[7] All 3 found higher rates in rural communities, and this difference was significant in France and Bulgaria. It is surprising that, in the context of important urbanization changes, these results, reported nearly 20 years ago, did not trigger more research. This could be partly explained by the localization of most European population stroke registries in urban areas, and therefore their inability to address the question. On the contrary, the French Brest Stroke Registry (BSR), which was launched in 2008, covers the entire western area of the Brittany peninsula in France. This specific feature allowed us to investigate whether stroke incidence and case fatality varied as a function of urban/rural area.

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