AI Article Synopsis
- The study analyzed stroke admissions data from 155 hospitals across 20 U.S. states between 2004 and 2008, involving nearly 200,000 cases classified into ischemic, hemorrhagic, and transient ischemic attack categories.
- The researchers used autocorrelation and time-series analyses to investigate the relationship between weather patterns and stroke admissions, finding no significant seasonal changes or associations with stroke subtypes.
- The findings indicate that any previous correlations between weather and stroke admissions should be viewed skeptically, as the true relationship appears to be minimal or non-existent.
Article Abstract
Weather is the most frequently proposed factor driving apparent seasonal trends in stroke admissions. Here, we present the largest study of the association between weather and ischemic stroke in the USA to date. We consider admissions to 155 United States hospitals in 20 states during the five-year period from 2004 to 2008. The data set included 196,439 stroke admissions, which were classified as ischemic (n=98,930), hemorrhagic (n=18,960), or transient ischemic attack (n=78,549). Variations in stroke admissions were tested to determine if they tracked seasonal and transient weather patterns over the same time period. Using autocorrelation analyses, no significant seasonal changes in stroke admissions were observed over the study period. Using time-series analyses, no significant association was observed between any weather variable and any stroke subtype over the five-year study. This study suggests that seasonal associations between weather and stroke are highly confounded, and an association between weather and stroke is virtually non-existent. Therefore, previous studies reporting an association between specific weather patterns and stroke should be interpreted with caution.
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| http://dx.doi.org/10.1016/j.jocn.2010.08.035 | DOI Listing |
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