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Time dependent memory decay.

Abstract

BACKGROUND: To estimate the rate of time dependent memory decay, injury rates from three independent studies were compared. METHODS: The studies asked subjects to recall injuries during the previous 2 months, 12 months, or 10 years. RESULTS: The annual injury rates obtained were 108/1,000, 66/1,000, and 19/1,000, respectively. These rates are all significantly different from one another at the 0.05 level. CONCLUSIONS: Important methodological and demographic differences between the studies, such as those involving age, injury severity, and seasonality, were ruled out as causes of these differences. Results found in the literature for other studies are compared and contrasted. These data suggest that recall periods of greater than 2 months are likely to significantly underestimate injury rates.

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BibTeXRIS

Paul Jenkins, Giulia Earle-Richardson, David Tucker Slingerland, John May. 2002. Time dependent memory decay.. https://doi.org/10.1002/ajim.10035

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Medical and socio-professional impact of insomnia.

STUDY OBJECTIVES: Insomnia, a highly prevalent disorder with direct and indirect economic and professional consequences, affects daytime functioning, behavior, and quality of life. Several studies have shown that insomnia affects the workforce and is associated with an increased risk of accidents. Insomnia may also play a role in other disorders. Our study attempted to evaluate the socio-professional correlates of insomnia by comparing a group of insomniacs to a group of good sleepers. DESIGN: With a questionnaire focused on the socio-professional and medical consequences of insomnia, we surveyed a group of severe insomniacs and a group of good sleepers. Persons with psychiatric disorders according to the DSM-IV minimum criteria for anxiety and depression were eliminated from each group. After screening, 240 insomniacs and 391 good sleepers remained and were then compared. MEASUREMENTS AND RESULTS: Compared to good sleepers, severe insomniacs reported more medical problems, had more physician-office visits, were hospitalized twice as often, and used more medication. Severe insomniacs had a higher rate of absenteeism, missing work twice as often as did good sleepers. They also had more problems at work (including decreased concentration, difficulty performing duties, and more work-related accidents). CONCLUSIONS: Our study showed that insomnia has socio-professional consequences and is correlated with lower medical status.

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