A meta-analysis of Fitbit devices: same company, different models, different validity evidence

Author(s):  
Willie Leung ◽  
Layne Case ◽  
Ming-Chih Sung ◽  
Jaehun Jung
2020 ◽  
pp. 153450842092658 ◽  
Author(s):  
Jeremy R. Sullivan ◽  
Victor Villarreal ◽  
Evette Flores ◽  
Alyssa Gomez ◽  
Blaire Warren

This article documents the results of a meta-analysis of available correlational validity evidence for the Social Skills Improvement System Performance Screening Guide (SSIS-PSG), which is a brief teacher-completed rating scale designed to be used as part of universal screening procedures. Article inclusion criteria included (a) published in English in a peer-reviewed journal, (b) administration of the PSG, and (c) provided validity evidence representative of the relationship between PSG scores and scores on related variables. Ten studies yielding 147 correlation coefficients met criteria for inclusion. Data were extracted following established procedures in validity generalization and meta-analytic research. Extracted coefficients were of the expected direction and magnitude with theoretically aligned constructs, thereby providing evidence of convergent validity (e.g., PSG Math and Reading items were most strongly correlated with academic performance and academic behavior variables, with effect sizes ranging from .708 to .740; PSG Prosocial Behavior and Motivation to Learn items were most strongly correlated with broadband externalizing/internalizing problems, with effect sizes ranging from −.706 to −.717), although Prosocial Behavior and Motivation to Learn were not as effective at discriminating among divergent constructs. These results generally support the utility of the PSG in correlating with academic and social/behavioral outcomes in the schools.


2021 ◽  
Author(s):  
Yali Wei ◽  
Yan Meng ◽  
Na Li ◽  
Qian Wang ◽  
Liyong Chen

The purpose of the systematic review and meta-analysis was to determine if low-ratio n-6/n-3 long-chain polyunsaturated fatty acid (PUFA) supplementation affects serum inflammation markers based on current studies.


2013 ◽  
Vol 18 (1) ◽  
pp. 1-18 ◽  
Author(s):  
Robert J. Barth

Abstract Scientific findings have indicated that psychological and social factors are the driving forces behind most chronic benign pain presentations, especially in a claim context, and are relevant to at least three of the AMA Guides publications: AMA Guides to Evaluation of Disease and Injury Causation, AMA Guides to Work Ability and Return to Work, and AMA Guides to the Evaluation of Permanent Impairment. The author reviews and summarizes studies that have identified the dominant role of financial, psychological, and other non–general medicine factors in patients who report low back pain. For example, one meta-analysis found that compensation results in an increase in pain perception and a reduction in the ability to benefit from medical and psychological treatment. Other studies have found a correlation between the level of compensation and health outcomes (greater compensation is associated with worse outcomes), and legal systems that discourage compensation for pain produce better health outcomes. One study found that, among persons with carpal tunnel syndrome, claimants had worse outcomes than nonclaimants despite receiving more treatment; another examined the problematic relationship between complex regional pain syndrome (CRPS) and compensation and found that cases of CRPS are dominated by legal claims, a disparity that highlights the dominant role of compensation. Workers’ compensation claimants are almost never evaluated for personality disorders or mental illness. The article concludes with recommendations that evaluators can consider in individual cases.


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