JAMA : the journal of the American Medical Association
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To examine the independent relationship between effectiveness of bystander cardiopulmonary resuscitation (CPR) and survival following out-of-hospital cardiac arrest. ⋯ The association between bystander CPR and survival in out-of-hospital cardiac arrest appears to be confounded by CPR quality. Effective CPR is independently associated with a quantitatively and statistically significant improvement in survival.
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Meta Analysis
The relationship between methodological quality and conclusions in reviews of spinal manipulation.
To study the relationship between the methodological quality and other characteristics of reviews of spinal manipulation for low back pain on the one hand and the reviewers' conclusions on the effectiveness of manipulation on the other hand. ⋯ The majority of the reviews concluded that spinal manipulation is an effective treatment for low back pain. Although, in particular, the reviews with a relatively high methodological quality had a positive conclusion, strong conclusions were precluded by the overall low quality of the reviews. More empirical research on the review methods applied to other therapies in other professional fields is needed to further explore our findings about the factors related to a positive reviewers' conclusion.
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To assess the long-term relationship of midlife blood pressure levels to late-life cognitive function. ⋯ Midlife SBP is a significant predictor of reduced cognitive function in later life. Early control of SBP levels may reduce the risk for cognitive impairment in old age.