Publications by authors named "Christopher Yager"

2 Publications

  • Page 1 of 1

Advancing the Certified in Public Health Examination: A Job Task Analysis.

Public Health Rep 2017 Jul/Aug;132(4):518-523. Epub 2017 Jun 22.

6 Center for Education Testing and Evaluation, University of Kansas, Kansas City, KS, USA.

Objectives: In 2014, the National Board of Public Health Examiners performed a job task analysis (JTA) to revise the Certified in Public Health (CPH) examination. The objectives of this study were to describe the development, administration, and results of the JTA survey; to present an analysis of the survey results; and to review the implications of this first-ever public health JTA.

Methods: An advisory committee of public health professionals developed a list of 200 public health job tasks categorized into 10 work domains. The list of tasks was incorporated into a web-based survey, and a snowball sample of public health professionals provided 4850 usable responses. Respondents rated job tasks as essential (4), very important (3), important (2), not very important (1), and never performed (0).

Results: The mean task importance ratings ranged from 2.61 to 3.01 (important to very important). The highest mean ratings were for tasks in the ethics domain (mean rating, 3.01). Respondents ranked 10 of the 200 tasks as the most important, with mean task rankings ranging from 2.98 to 3.39. We found subtle differences between male and female respondents and between master of public health and doctor of public health respondents in their rankings.

Conclusion: The JTA established a set of job tasks in 10 public health work domains, and the results provided a foundation for refining the CPH examination. Additional steps are needed to further modify the content outline of the examination. An empirical assessment of public health job tasks, using methods such as principal components analysis, may provide additional insight.
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July 2017

Objectively Measured Sleep and β-amyloid Burden in Older Adults: A Pilot Study.

SAGE Open Med 2014 Aug;2

Department of Neurology, Johns Hopkins School of Medicine, Baltimore, MD ; Department of Neuroscience, Johns Hopkins School of Medicine, Baltimore, MD.

Background/aims: Although disturbed sleep is associated with cognitive deficits, the association between sleep disturbance and Alzheimer's disease (AD) pathology is unclear. In this pilot study, we examined the extent to which sleep duration, sleep quality, and sleep-disordered breathing (SDB) are associated with β-amyloid (Aβ) deposition in the brains of living humans.

Methods: We studied 13 older adults (8 with normal cognition and 5 with mild cognitive impairment (MCI)). Participants completed neuropsychological testing, polysomnography and Aβ imaging with [C]-Pittsburgh compound B.

Results: Among participants with MCI, higher apnea-hypopnea index and oxygen desaturation index were associated with greater Aβ deposition, globally and regionally in the precuneus. There were no significant associations between SDB and Aβ deposition among cognitively normal participants. There were no significant associations between sleep duration or sleep fragmentation and Aβ deposition.

Conclusion: These preliminary results suggest that, among older adults with MCI, greater SDB severity is associated with greater Aβ deposition.
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August 2014