scholarly journals Condition dependence in animal colouration: tools for a comparative approach

2016 ◽  
Author(s):  
Jessica Ethier ◽  
Emma Despland
Keyword(s):  
Resource Allocation ◽  
Theoretical Model ◽  
Linear Regression ◽  
Simple Equation ◽  
Condition Dependence ◽  
Comparative Approach ◽  
Regression Analyses ◽  
Proximate Mechanisms ◽  
The Past ◽  
Animal Colouration

The study of condition dependence in animal colour has undergone important changes in recent years. In particular, the focus on carotenoid-based colour traits is a thing of the past and a broader, comparative approach is becoming more common. Here, we refine a previously developed theoretical model describing pigment expression as a saturating function of resource intake and demonstrate its use as a tool to compare patterns of resource assimilation, resource allocation, and condition dependence between groups of organisms. Using a simple equation and non-linear regression analyses, we apply this saturating model to melanin-based colouration in a model insect species. We find that patterns of condition dependence differ between sexes, phenotypes, and populations, suggesting underlying differences in resource allocation priorities. Our results highlight both the usefulness of this method and the value of a comparative approach in identifying proximate mechanisms of condition dependence.

scholarly journals Condition dependence in animal colouration: tools for a comparative approach

2016 ◽  
Author(s):  
Jessica Ethier ◽  
Emma Despland
Keyword(s):  
Resource Allocation ◽  
Theoretical Model ◽  
Linear Regression ◽  
Simple Equation ◽  
Condition Dependence ◽  
Comparative Approach ◽  
Regression Analyses ◽  
Proximate Mechanisms ◽  
The Past ◽  
Animal Colouration

The study of condition dependence in animal colour has undergone important changes in recent years. In particular, the focus on carotenoid-based colour traits is a thing of the past and a broader, comparative approach is becoming more common. Here, we refine a previously developed theoretical model describing pigment expression as a saturating function of resource intake and demonstrate its use as a tool to compare patterns of resource assimilation, resource allocation, and condition dependence between groups of organisms. Using a simple equation and non-linear regression analyses, we apply this saturating model to melanin-based colouration in a model insect species. We find that patterns of condition dependence differ between sexes, phenotypes, and populations, suggesting underlying differences in resource allocation priorities. Our results highlight both the usefulness of this method and the value of a comparative approach in identifying proximate mechanisms of condition dependence.

The Oxford History of Historical Writing

2018 ◽  
Keyword(s):  
Early Modern ◽  
Korean Peninsula ◽  
Comparative Approach ◽  
Modern World ◽  
Historical Writing ◽  
North West ◽  
The Past ◽  
History Of

How was history written in Europe and Asia between 400–1400? How was the past understood in religious, social, and political terms? And in what ways does the diversity of historical writing in this period mask underlying commonalities in narrating the past? The volume tackles these and other questions. Part I provides comprehensive overviews of the development of historical writing in societies that range from the Korean Peninsula to north-west Europe, which together highlight regional and cultural distinctiveness. Part II complements the first part by taking a thematic and comparative approach; it includes chapters on genre, warfare, and religion (amongst others) which address common concerns of historians working in this liminal period before the globalizing forces of the early modern world.

785 Reported Restful Sleep Predicting Emotional Distress: Does Exercise (and its modalities) moderate?

SLEEP ◽  
2021 ◽  
Vol 44 (Supplement_2) ◽  
pp. A305-A306
Author(s):  
Jesse Moore ◽  
Ellita Williams ◽  
Collin Popp ◽  
Anthony Briggs ◽  
Judite Blanc ◽  
...  
Keyword(s):  
Logistic Regression ◽  
Aerobic Exercise ◽  
Regression Models ◽  
Regression Analyses ◽  
Logistic Regression Models ◽  
The Past ◽  
Strengthening Exercise ◽  
Waking Up ◽  
The Relationship ◽  
Age And Sex

Abstract Introduction Literature shows that exercise moderates the relationship between sleep and emotional distress (ED.) However, it is unclear whether different types of exercise, such as aerobic and strengthening, affect this relationship differently. We investigated the moderating role of two types of exercise (aerobic and strengthening) regarding the relationship between ED and sleep. Methods Our analysis was based on data from 2018 National Health Interview Survey (NHIS), a nationally representative study in which 2,814 participants provided all data. Participants were asked 1) “how many days they woke up feeling rested over the past week”, 2) the Kessler 6 scale to determine ED (a score >13 indicates ED), and 3) the average frequency of strengthening or aerobic exercise per week. Logistic regression analyses were performed to determine if the reported days of waking up rested predicted level of ED. We then investigated whether strengthening or aerobic exercise differentially moderated this relationship. Covariates such as age and sex were adjusted in the logistic regression models. Logistic regression analyses were performed to determine if subjective reporting of restful sleep predicted level of ED. We investigated whether strengthening exercise or aerobic exercise differentially moderated this relationship. Covariates such as age and sex were adjusted in the logistic regression models. Results On average, participants reported 4.41 restful nights of sleep (SD =2.41), 3.43 strengthening activities (SD = 3.19,) and 8.47 aerobic activities a week (SD=5.91.) We found a significant association between days over the past week reporting waking up feeling rested and ED outcome according to K6, Χ2(1) = -741, p= <.001. The odds ratio signified a decrease of 52% in ED scores for each unit of restful sleep (OR = .48, (95% CI = .33, .65) p=<.001.) In the logistic regression model with moderation, aerobic exercise had a significant moderation effect, Χ2(1) = .03, p=.04, but strengthening exercise did not. Conclusion We found that restful sleep predicted reduction in ED scores. Aerobic exercise moderated this relationship, while strengthening exercise did not. Further research should investigate the longitudinal effects of exercise type on the relationship between restful sleep and ED. Support (if any) NIH (K07AG052685, R01MD007716, K01HL135452, R01HL152453)

scholarly journals Regression analyses of questionnaires in bedside teaching

2020 ◽  
Vol 20 (1) ◽  
Author(s):  
Wolf Ramackers ◽  
Julia Victoria Stupak ◽  
Indra Louisa Marcheel ◽  
Annette Tuffs ◽  
Harald Schrem ◽  
...  
Keyword(s):  
Logistic Regression ◽  
Linear Regression ◽  
Survey Data ◽  
Organizational Structures ◽  
Bedside Teaching ◽  
Regression Analyses ◽  
Negative Perception ◽  
Data Analyses ◽  
Main Target ◽  
Relevant Factors

Abstract Background Students’ ratings of bedside teaching courses are difficult to evaluate and to comprehend. Validated systematic analyses of influences on students’ perception and valuation of bedside teaching can serve as the basis for targeted improvements. Methods Six hundred seventy-two observations were conducted in different surgical departments. Survey items covered the categories teacher’s performance, student’s self-perception and organizational structures. Relevant factors for the student overall rating were identified by multivariable linear regression after exclusion of variable correlations > 0.500. The main target for intervention was identified by the 15% worst overall ratings via multivariable logistic regression. Results According to the students the success of bedside teaching depended on their active participation and the teacher’s explanations of pathophysiology. Further items are both relevant to the overall rating and a possible negative perception of the session. In comparison, negative perception of courses (worst 15%) is influenced by fewer variables than overall rating. Variables that appear in both calculations show slight differences in their weighing for their respective endpoints. Conclusion Relevant factors for overall rating and negative perception in bedside teaching can be identified by regression analyses of survey data. Analyses provide the basis for targeted improvement.

Factors of Dementia Caregiver Burden Differentially Contribute to Desire to Institutionalize

2021 ◽  
pp. 089198872110361
Author(s):  
John T. Martin ◽  
Kimberly R. Chapman ◽  
Christopher Was ◽  
Mary Beth Spitznagel
Keyword(s):  
Factor Analysis ◽  
Linear Regression ◽  
Factor Structure ◽  
Caregiver Burden ◽  
Living Arrangements ◽  
Regression Analyses ◽  
Loved One ◽  
Dementia Caregiver ◽  
Future Work ◽  
Made In

The experience of dementia caregiver burden is multidimensional. Little is known about how different aspects of burden contribute to the consideration of moving a loved one to a structured living facility. In the present study, caregiver burden (Zarit Burden Interview; ZBI) and consideration of structured living arrangements (Desire to Institutionalize Scale; DIS) were self-reported by 339 caregivers. Exploratory factor analysis was used to determine the ZBI factor structure; these factors were then examined via hierarchical linear regression for prediction of DIS. Factor analysis indicated a 4-factor ZBI solution: Impact on Life, Guilt, Embarrassment/Frustration, and Escape/Uncertainty. Regression analyses indicated that only Escape/Uncertainty ( p < .001) was associated with DIS. Of the 4 identified factors of caregiver burden, desire to escape the caregiving role was most related to consideration of structured living arrangements. Future work should explore longitudinal contribution of this factor to determine its role in actual changes made in living arrangements.

scholarly journals Correlates of the discrepancy between objective and subjective cognitive functioning in non-demented patients with Parkinson’s disease

2021 ◽  
Author(s):  
Mattia Siciliano ◽  
Lugi Trojano ◽  
Rosa De Micco ◽  
Valeria Sant’Elia ◽  
Alfonso Giordano ◽  
...  
Keyword(s):  
Parkinson’S Disease ◽  
Parkinson's Disease ◽  
Linear Regression ◽  
Cognitive Functioning ◽  
Rating Scale ◽  
Regression Analyses ◽  
Chi Square ◽  
Cognitive Measure ◽  
Objective Evidence ◽  
Cognitive Discrepancy

Abstract Background Subjective complaints of cognitive deficits are not necessarily consistent with objective evidence of cognitive impairment in Parkinson’s disease (PD). Here we examined the factors associated with the objective-subjective cognitive discrepancy. Methods We consecutively enrolled 90 non-demented patients with PD who completed the Parkinson’s Disease Cognitive Functional Rating Scale (subjective cognitive measure) and the Montreal Cognitive Assessment (MoCA; objective cognitive measure). The patients were classified as “Overestimators”, “Accurate estimators”, and “Underestimators” on the basis of the discrepancy between the objective vs. subjective cognitive measures. To identify the factors distinguishing these groups from each other, we used chi-square tests or one-way analyses of variance, completed by logistic and linear regression analyses. Results Forty-nine patients (54.45%) were classified as “Accurate estimators”, 29 (32.22%) as “Underestimators”, and 12 (13.33%) as “Overestimators”. Relative to the other groups, the “Underestimators” scored higher on the Fatigue Severity Scale (FSS), Beck Depression Inventory (BDI), and Parkinson Anxiety Scale (p < 0.01). Logistic regression confirmed that FSS and BDI scores distinguished the “Underestimators” group from the others (p < 0.05). Linear regression analyses also indicated that FSS and BDI scores positively related to objective-subjective cognitive discrepancy (p < 0.01). “Overestimators” scored lower than other groups on the MoCA’s total score and attention and working memory subscores (p < 0.01). Conclusion In more than 45% of consecutive non-demented patients with PD, we found a ‘mismatch’ between objective and subjective measures of cognitive functioning. Such discrepancy, which was related to the presence of fatigue and depressive symptoms and frontal executive impairments, should be carefully evaluated in clinical setting.

scholarly journals Orthostatic Blood Pressure Recovery Measured Using a Sphygmomanometer Is Not Associated with Physical Performance or Number of Falls in Geriatric Outpatients

Gerontology ◽  
2021 ◽  
pp. 1-5
Author(s):  
Arjen Mol ◽  
Marieke Esmé Charlotte Blom ◽  
Danique Johanna van den Bosch ◽  
Richard Jack Anton Van Wezel ◽  
Carel G.M. Meskers ◽  
...  
Keyword(s):  
Blood Pressure ◽  
Physical Performance ◽  
Clinical Relevance ◽  
Regression Analyses ◽  
Timed Up And Go ◽  
Entire Cohort ◽  
The Past ◽  
Orthostatic Blood Pressure ◽  
Standing Up ◽  
Age And Sex

<b><i>Background:</i></b> Orthostatic hypotension (OH) and impaired OH recovery derived from beat-to-beat blood pressure (BP) measurements are associated with detrimental clinical outcome, but the clinical relevance of OH recovery assessed using the widely available sphygmomanometer is still unclear. <b><i>Method:</i></b> 635 geriatric outpatients underwent comprehensive geriatric assessment, including orthostatic BP measurements using a sphygmomanometer, during supine rest and 1 and 3 min after standing up and assessment of physical performance (i.e., the timed up and go test and the Short Physical Performance Battery) and the number of falls in the past year. The association between BP recovery, defined as BP at 3 min minus BP at 1 min after standing up, with physical performance and falls was assessed using regression analyses, adjusting for age and sex, both in the entire cohort and after stratifying for the presence of OH at 1 min after standing up. <b><i>Results:</i></b> BP recovery was not associated with physical performance or number of falls, neither in the entire cohort, nor in subpopulations with or without OH. <b><i>Conclusion:</i></b> The clinical relevance of BP recovery between 1 and 3 min after standing up could not be demonstrated. The results suggest that sphygmomanometer measurements have an inadequate time resolution to record the clinically relevant dynamics of orthostatic BP recovery.

Youth and Parent Participation in Transition Planning in the U.S.A.: Findings from the National Longitudinal Transition Study 2012 (NLTS 2012)

2022 ◽  
Author(s):  
David R. Johnson ◽  
Martha L. Thurlow ◽  
Yi-Chen Wu ◽  
Xueqin Qian ◽  
Ernest Davenport ◽  
...  
Keyword(s):  
Transition Planning ◽  
Parent Participation ◽  
Individualized Education Program ◽  
The United States ◽  
Significant Decline ◽  
Regression Analyses ◽  
The Past ◽  
Transition Study ◽  
Disability Categories ◽  
National Longitudinal Transition Study

Abstract The purpose of this study was to use data from the United States' National Longitudinal Transition Study 2012 (NLTS 2012) to present descriptive information on youth and parent participation and youth's role in required Individualized Education Program (IEP)/transition planning meetings by disability category and age groupings (14-22 year olds, 14-15 year olds, and 16-22 year olds). The study found that youth and parent attendance in IEP/transition planning meetings was high across disability categories, but the extent to which youth and parents met with teachers to discuss transition goals was much lower. Data from NLTS 2012 and a previous U.S. study, the National Longitudinal Transition Study 2 (NLTS2), were compared for youth's participation with school staff in discussing transition goals. A significant decline in participation was found over the past decade. Logistic regression analyses illustrated differences in youth and parent participation and youth's role by disability category.

Sign in / Sign up

Export Citation Format

Share Document