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Accurate measurement of physical activity is fundamentally important in epidemiological research of physical activity behavior A widely used telephone-based physical activity questionnaire was compared with other methods of administration and objective measures (pedometers and accelerometers) among 80 adults (43 women). The telephone questionnaire was comparable to both the self-administered form and international telephone-administered equivalent. Although moderate correlation coefficients with objective measures supported the use of the questionnaire, wide prediction intervals generated using Bland Altman methods highlighted large discrepancies between the measures, particularly in the moderate intensity category. These findings illustrate the limitations of correlation coefficients in validation studies and the inaccuracy of self-report questionnaires in measuring physical activity. 相似文献
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Jerome M. Sattler John R. Andres Lisa S. Squire Rick Wisely Christopher F. Maloy 《Psychology in the schools》1978,15(4):486-489
Fabricated test protocols were used to study how effectively examiners agree in scoring ambiguous WISC-R responses. Clinical and school psychologists (N = 62) and graduate students (N = 48) scored WISC-R Similarities, Comprehension, and Vocabulary responses obtained in a group administration procedure. From over 15,000 responses obtained, only unusual, atypical, or ambiguous responses were selected; 726 responses were scored, with 11 groups of 10 raters each scoring 66 responses. Considerable scoring disagreement occurred. Unanimous agreement (within each group of 10 raters) was found on only 13% of the responses, while 80% of the raters agreed on 44% of the responses. Rates of scoring agreement were not related to level of rater experience, but were related to specific subtests. Higher rates of agreement were found on the Similarities and Comprehension subtests than on the Vocabulary subtest for both experienced and inexperienced raters. The results suggest that even with the improved WISC-R manual, scoring remains a difficult and challenging task. 相似文献
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The study assessed the effects of achievement standards, and choice of such standards, on mathematics performance in conditions where no tangible rewards were presented for reaching such standards. Elementary, junior high, and high school students performed a multiplication task in conditions where they chose standards, had standards imposed by an experimenter, or had no standards. Results demonstrated that high school students worked more multiplication problems when they chose standards than when identical standards were imposed by an experimenter or when no standards were present. Moreover, male students who chose standards worked more problems than did male students who had no standards; this effect was not found for female students. 相似文献
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According to the U.S. Bureau of the Census, in 1998 the 65-74 years age group (18.4 million) was eight times larger than in 1900, the 75-84 years age group (12 million) was 16 times larger, and the 85 and older years age group (4 million) was 33 times larger. It is anticipated that if this trend continues, by 2030, there will be about 70 million older American persons, more than twice their number in 1998. To meet the needs of the older population, governments, foundations, nonprofit organizations, and other groups will have to continue to work on how to increase availability, accessibility, and adequacy of community-based services. One approach will be to encourage community collaboration and partnerships. Funding agencies have encouraged university-community collaboration in recent years. However, none of the studies reviewed for this paper addressed the need for the type of university-community collaboration that our study deals with (i.e., university-community agency collaboration). In particular, our study investigates human service agency workers' perceptions of the availability, accessibility, and adequacy of services to the elderly in Northwest Ohio, and how collaboration with a university can improve service delivery to consumers. The findings of the study provide a general indication of trends, experiences, and problems common to these agencies. The findings also suggest that agency workers do not necessarily have a negative perception of university-community agency collaboration, rather many do not understand how such collaborations will improve services to consumers. Recommendations regarding how to enhance university-community collaborations are made. 相似文献
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In today's fast-paced environment, traditional medical reference services alone are not adequate to meet users' information needs. Efforts to find new ways to provide comprehensive service to users, where and when needed, have often included the use of new and developing technologies. This paper describes the experience of an academic health science library in developing and providing an online, real-time reference service. Issues discussed include selecting software, training librarians, staffing the service, and considering the future of the service. Use statistics, question type analysis, and feedback from users of the service and librarians who staff the service, are also presented. 相似文献