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141.
142.
Planning a study using the General Linear Univariate Model often involves sample size calculation based on a variance estimated in an earlier study. Noncentrality, power, and sample size inherit the randomness. Additional complexity arises if the estimate has been censored. Left censoring occurs when only significant tests lead to a power calculation, while right censoring occurs when only non-significant tests lead to a power calculation. We provide simple expressions for straightforward computation of the distribution function, moments, and quantiles of the censored variance estimate, estimated noncentrality, power, and sample size. We also provide convenient approximations and evaluate their accuracy. The results allow demonstrating that ignoring right censoring falsely widens confidence intervals for noncentrality and power, while ignoring left censoring falsely narrows the confidence intervals. The new results allow assessing and avoiding the potentially substantial bias that censoring may create. 相似文献
143.
This article discusses estimation of several percentiles simultaneously, develops a simple test to compare the sizes of two test statistics, and considers the use of logit models to adjust power curves to have the same null hypothesis level. 相似文献
144.
Priddis H Dahlen H Schmied V 《Women and birth : journal of the Australian College of Midwives》2012,25(3):100-106
BackgroundFrom the historical literature it is apparent that birthing in an upright position was once common practice while today it appears that the majority of women within Western cultures give birth in a semi-recumbent position.AimTo undertake a review of the literature reporting the impact of birth positions on maternal and perinatal wellbeing, and the factors that facilitate or inhibit women adopting various birth positions throughout the first and second stages of labour.MethodsA search strategy was designed to identify the relevant literature, and the following databases were searched: CINAHL, CIAP, the Cochrane Database of Systematic Reviews, Medline, Biomed Central, OVID and Google Scholar. The search was limited to the last 15 years as current literature was sought. Over 40 papers were identified as relevant and included in this literature review.ResultsThe literature reports both the physical and psychological benefits for women when they are able to adopt physiological positions in labour, and birth in an upright position of their choice. Women who utilise upright positions during labour, have a shorter duration of the first and second stage of labour, experience less intervention, and report less severe pain and increased satisfaction with their childbirth experience than women in a semi recumbent or supine/lithotomy position. Increased blood loss during third stage is the only disadvantage identified but this may be due to increased perineal oedema associated with upright positions. There is a lack of research into factors and/or practices within the current health system that facilitate or inhibit women to adopt various positions during labour and birth. Upright birth positioning appears to occur more often within certain models of care, and birth settings, compared to others. The preferences for positions, and the philosophies of health professionals, are also reported to impact upon the position that women adopt during birth.ConclusionUnderstanding the facilitators and inhibitors of physiological birth positioning, the impact of birth settings and how midwives and women perceive physiological birth positions, and how beliefs are translated into practice needs to be researched. 相似文献
145.
Scott Huberty Christian O’Reilly Virginia Carter Leno Mandy Steiman Sara Webb Mayada Elsabbagh The BASIS Team 《Infancy》2023,28(4):754-770
Understanding the neural processes underpinning individual differences in early language development is of increasing interest, as it is known to vary in typical development and to be quite heterogeneous in neurodevelopmental conditions. However, few studies to date have tested whether early brain measures are indicative of the developmental trajectory of language, as opposed to language outcomes at specific ages. We combined recordings from two longitudinal studies, including typically developing infants without a family history of autism, and infants with increased likelihood of developing autism (infant-siblings) (N = 191). Electroencephalograms (EEG) were recorded at 6 months, and behavioral assessments at 6, 12, 18, 24 and 36 months of age. Using a growth curve model, we tested whether absolute EEG spectral power at 6 months was associated with concurrent language abilities, and developmental change in language between 6 and 36 months. We found evidence of an association between 6-month alpha-band power and concurrent, but not developmental change in, expressive language ability in both infant-siblings and control infants. The observed association between 6-month alpha-band power and 6-month expressive language was not moderated by group status, suggesting some continuity in neural mechanisms. 相似文献
146.
Danny Rahal Virginia W. Huynh Michael R. Irwin Heather McCreath Andrew J. Fuligni 《Journal of research on adolescence》2024,34(1):141-158
The present study examined whether everyday discrimination relates to the frequency of adolescents' positive and negative daily social interactions and whether these associations are driven by anger and positive emotion. Adolescents (N = 334) participated in a three-wave longitudinal study, in which they completed surveys regarding everyday discrimination, anger, and positive emotion, as well as 15 daily reports of conflict and getting along with friends and family. Higher everyday discrimination was related to more daily conflicts and fewer experiences of getting along with other people. Longitudinal models also provided preliminary evidence that everyday discrimination was associated with daily conflicts 4 years later indirectly through anger. Overall, results suggest everyday discrimination relates to adolescents' daily experiences, potentially through differences in emotion. 相似文献
147.
MA Barwick HM Schachter LM Bennett J McGowan M Ly A Wilson K Bennett DH Buchanan D Fergusson I Manion 《Journal of evidence-based social work》2012,9(4):369-395
The availability of knowledge translation strategies that have been empirically studied and proven useful is a critical prerequisite to narrowing the research-to-practice gap in child and youth mental health. Through this review the authors sought to determine the current state of scientific knowledge of the effectiveness of knowledge translation approaches in child and youth mental health by conducting a systematic review of the research evidence. The findings and quality of the 12 included studies are discussed. Future work of high methodological quality that explores a broader range of knowledge translation strategies and practitioners to which they are applied and that also attends to implementation process is recommended. 相似文献
148.
Virginia Deane Abernethy 《Population and environment》2000,21(5):469-472
149.
Population and Environment - 相似文献
150.
Virginia L. Olesen 《Symbolic Interaction》1994,17(2):231-237
Good Days, Bad Days: The Self in Chronic Illness and Time , by Kathy Charmaz. At The Will of The Body: Reflections on Illness , by Arthur W. Frank. The Body: Social Process and Cultural Theory , edited by Mike Featherstone, Mike Hepworth, and Bryan S. Turner. 相似文献