Title |
Comparing effects: a reanalysis of two studies on season of birth bias in anorexia nervosa
|
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Published in |
Journal of Eating Disorders, January 2017
|
DOI | 10.1186/s40337-016-0131-1 |
Pubmed ID | |
Authors |
Eirin Winje, Anne-Kari Torgalsbøen, Cathrine Brunborg, Kristin Stedal |
Abstract |
Outcomes from studies on season of birth bias in eating disorders have been inconsistent. This inconsistency has been explained by differences in methodologies resulting in different types of effect sizes. The aim of the current study was to facilitate comparison by using the same methodology on samples from two studies with differing conclusions. The statistical analyses used in each study were applied to the samples from the other study and the resulting effect sizes, Cramêr's V and odds ratio (OR), were compared and discussed. For both studies, the Cramêr's Vs ranged between 0.03 and 0.08 and the OR ranged between 0.85 and 1.31. According to common conventions, Cramêr's Vs below 0.10 and ORs below 1.44 are considered small. As a marker of one or more potential risk factors, the observed effects are considered to be small. When reanalysed allowing for direct comparisons, studies with contrasting conclusions converge towards an absence of support for a season of birth bias for patients with AN. |
X Demographics
Geographical breakdown
Country | Count | As % |
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Norway | 2 | 25% |
United States | 1 | 13% |
Unknown | 5 | 63% |
Demographic breakdown
Type | Count | As % |
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Members of the public | 5 | 63% |
Scientists | 1 | 13% |
Practitioners (doctors, other healthcare professionals) | 1 | 13% |
Science communicators (journalists, bloggers, editors) | 1 | 13% |
Mendeley readers
Geographical breakdown
Country | Count | As % |
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Unknown | 11 | 100% |
Demographic breakdown
Readers by professional status | Count | As % |
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Student > Bachelor | 2 | 18% |
Student > Master | 2 | 18% |
Professor > Associate Professor | 2 | 18% |
Researcher | 2 | 18% |
Student > Ph. D. Student | 1 | 9% |
Other | 2 | 18% |
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Psychology | 5 | 45% |
Medicine and Dentistry | 3 | 27% |
Nursing and Health Professions | 1 | 9% |
Agricultural and Biological Sciences | 1 | 9% |
Mathematics | 1 | 9% |
Other | 0 | 0% |