Variation In Hours Research Articles

Exploring perceived relationships between weather, climate and mental health: biometeorological perspectives of healthcare practitioners.

Over the last decade, there has been an increase in research examining the influence of weather and climate in mental health caseloads. Variations in temperature, sunshine hours, cloud cover, precipitation and extreme weather events have been statistically linked to diagnoses and increases in hospital admissions for several mental health conditions. This study aimed to explore whether mental health practitioners perceive there to be a link between mental health and daily, seasonal, or inter-annual shifts in various climate variables in South Africa, and the timing and causal mechanisms thereof. Semi-structured interviews were conducted with 50 practicing healthcare practitioners, and the data was analysed using thematic analysis. The findings of this research show that all 50 participants were aware of the link between weather, climate and mental health, primarily through their awareness of seasonal affective disorder. Of the 50 participants, 38 participants could explain the aetiology of seasonal affective disorder. Participants perceived sunlight and temperature to exert an influence on mental health. All 50 participants perceived exposure to sunlight to exert a positive influence on several mental health conditions. Of the 50 participants, 36 participants perceived increases in temperature to exert an adverse effect on mental health symptomology. A minority of 11 participants perceived precipitation to influence mental health conditions such as seasonal affective disorder, bipolar disorder, and substance abuse disorder. Participants' perceptions of the influence of precipitation on mental health provided a unique potential explanation of this relationship, which, at the time of writing, has not been discussed in formal research.

Evaluating Curriculum Differences in US PharmD Programs: A Peer Evaluation

ObjectiveTo evaluate the differences in curriculum structure and content and observe commonalities across various Doctor of Pharmacy (PharmD) programs in the United States. MethodsThis research involves the collection of course content and credit hour data from the curricula and course descriptions, course catalogs, and student handbooks of all the PharmD programs available on their websites and categorization based on the content areas outlined in the Accreditation Council of Pharmacy Education. The core courses, elective offerings, and experiential education (eg, Introductory and Advanced Pharmacy Practice Experience) were evaluated using Excel® for credit hours, integration, non-integration, program duration (3-year vs 4-year), and online offerings. ResultsOf 142 accredited schools/colleges, 135 were included in the study, which met the inclusion criteria. In total, 85 of these schools have an integrated curriculum, 19 have a 3-year curriculum, and 15 offer a distance learning pathway for a PharmD degree. Fourteen of the 37 required content areas from the Accreditation Council of Pharmacy Education Appendix 1 were identified, with more than 50% of schools listing no credit hours allocated. Only 9 areas had 90% or more of pharmacy schools allocating credit hours. On average, biomedical, pharmaceutical, social/administrative/behavioral, clinical sciences, experiential education, and electives allocate 10.6, 25.3, 17.1, 40.5, 45.5, and 7.0 credit hours, respectively. ConclusionEach school’s curriculum has a significant variation in credit hours, and there is an opportunity to simplify the curricular structure and content by reducing redundancy and increasing flexibility based on health care needs.

Exploring Quality and Requirements in Faculty Development Related to Teaching.

Little is known about medical school requirements for faculty development related to teaching (FDT) in medical education. This study examined the national landscape and local faculty perceptions of their own institution's FDT requirement. An electronic survey was disseminated to Faculty Affairs Offices in US medical schools to assess FDT requirements. A second survey was distributed to faculty within one medical school to gauge faculty perceptions related to existing FDT requirements. Responses were received from approximately 33% of US medical schools and 36% of local faculty. Few responding medical schools had formal FDT requirements. There was a wide range variation of hours and activities necessary to satisfy existing requirements and consequences for noncompliance. For respondents from schools that did not have a requirement, many saw value in considering a future requirement. Many local faculty agreed that the FDT requirement improved their teaching skills. When asked to share other thoughts about the FDT requirement, several qualitative themes emerged. This study helps establish a national benchmark for the status of FDT requirements in medical education and revealed information on how to optimize and/or improve such requirements. The authors offer five recommendations for schools to consider regarding FDT.

Cost of informal dementia care by US state, 2010‐2019

AbstractBackgroundThere are significant costs associated with dementia care throughout the world. These are expected to rise as populations age. Informal (unpaid) care represents a large fraction of these costs, although it is challenging to measure. In the United States, estimates of the cost of informal dementia care are dated and measured only at the national level. To fill this gap, we estimated the cost of informal care attributable to dementia through 2019 for each US state.MethodThe value of informal care is estimated as the replacement cost (cost of an equivalent number of hours of paid care) and opportunity cost (expected cost of forgone wages of the caregivers). We combine data from the Behavioral Risk Factor Surveillance System, the National Health and Aging Trends Study (NHATS), and the Health and Retirement Study to estimate caregiving hours at the state level from 2010‐2019. NHATS data are used to estimate the fraction of caregiving hours attributable to dementia.ResultIn 2019, the average annual per‐patient cost of informal care attributable to dementia was $42,271 ($37,338‐$47,898) using the replacement cost method and $19,769 ($15,711‐$25,029) using the opportunity cost method. These estimates imply a national cost of $207.2B ($183.1B‐$234.8B) or $96.9B ($77.0B‐$122.7B) per year, respectively. State‐level estimates show significant variation in informal caregiving hours per prevalent case of dementia. In 2019, the annual replacement cost of informal care provided per patient ranged from $15,885 ($13,941 ‐$17,979) in Nebraska to $71,438 ($63,155 ‐$80,316) in New Mexico. The opportunity cost had a larger spread in relative terms, ranging from $6,653 ($5,233‐$8,417) in Nebraska to $36,831 ($29,071‐$46,833) in Missouri. Co‐occurrence of diabetes mellitus prevalence is associated with more informal care hours for the average adult living with dementia, while average years of education of the caregiver is associated with fewer informal care hours.ConclusionThe hours spent on informal care per prevalent case of dementia vary dramatically by state. This work adds to our understanding of health and demographic factors that are associated with hours of informal care, which can help policymakers plan for future increases in dementia prevalence and assess policy to support caregivers.

Bank liquidity creation and religious observance: Evidence from Ramadan fasting

I examine the effect of religious observance, represented by fasting hours during the month of Ramadan, on bank liquidity creation. I exploit exogenous variation of Ramadan fasting hours that depends on: (1) the timing of Ramadan based on the rotating Islamic calendar; and (2) a country’s latitude. My results document that one additional Ramadan fasting hour reduces bank liquidity creation by 1.1% within countries with the share of Muslim population above 50%. No such effect is found in Muslim-minority countries. In terms of transmission channel, I find that intensified Ramadan fasting reduces the productivity of economic agents that use financial services, hence lower the demand for bank liquidity creation. My results are robust for a battery of sensitivity checks and omitted variables concerns. The results offer novel insights into the effect of a specific religious observance on bank liquidity creation in the Islamic world.

Seasonal light hours modulate peripheral clocks and energy metabolism in mice

Except for latitudes close to the equator, seasonal variation in light hours can change dramatically between summer and winter. Yet investigations into the interplay between energy metabolism and circadian rhythms typically use a 12h light:12h dark photoperiod corresponding to the light duration at the equator. We hypothesized that altering the seasonal photoperiod affects both the rhythmicity of peripheral tissue clocks and energy homeostasis. Mice were housed at photoperiods representing either light hours in summer, winter, or the equinox. Mice housed at a winter photoperiod exhibited an increase in the amplitude of rhythmic lipid metabolism and a modest reduction in fat mass and liver triglyceride content. Comparing melatonin-proficient and -deficient mice, the effect of seasonal light on energy metabolism was largely driven by differences in the rhythmicity of food intake and not melatonin. Together, these data indicate that seasonal light impacts energy metabolism by modulating the timing of eating.

Work Hours Volatility and Child Poverty: The Potential Mitigating Role of Safety Net Programs

Abstract Despite established links among persistent unemployment, low wages, and children’s economic well-being, social scientists have yet to document how variability in work hours is linked to child poverty. Our knowledge of the safety net’s heterogeneous responses to work-hour instability is also limited. This is of critical importance for scholars and policymakers. Using nationally representative data collected every 4 months, this paper examines how intra-year work-hour volatility is related to child poverty, measured through both the official poverty measure (OPM) and the supplemental poverty measure (SPM). It further assesses varying degrees of buffering effects of cash, in-kind benefits, and tax transfers on income in the context of work-hour volatility. Results indicate that more than one in four households (26%) facing the greatest volatility lived under the poverty line. Black and Hispanic children, as well as those living with unpartnered single mothers, faced substantially higher variability in household market hours worked. Hispanic children experienced not only greater volatility in their caregivers’ work hours but also higher poverty level, even after taking government programs into account. In-kind benefits are more effective in buffering household income declines resulting from unstable work hours, followed by tax transfers and cash benefits. The effectiveness of near-cash benefits is particularly salient among Black children and children of single mothers. These results provide new evidence to inform policy discussions surrounding the best ways to help socioeconomically disadvantaged families to retain benefits and smooth their income in the face of frequent variation in work hours and, thus, earnings.

Assessing the impact of sleep restriction on the attention and executive functions of medical students: a prospective cohort study.

To compare the performance of medical students regarding attention and executive functions during a period of sleep restriction (insufficient sleep; period of classes) and a period of free sleep (sufficient sleep; vacation period). Sleep deprivation is associated with poor academic outcomes. Few studies have assessed the cognitive changes associated with sleep deprivation due to insufficient sleep syndrome in students and how they occur in real-life situations. This was a prospective cohort study. Medical students were assessed at two moments (class and vacation). The interval between assessments was 30days. The Pittsburgh Sleep Quality Index, the Consensus Sleep Diary, the Montreal Cognitive Assessment, the Psychomotor Vigilance Test (PVT) and the Wisconsin Sorting Cards Test were used. Forty-one students were assessed, 49% were female, with a median age of 21 (20; 23) years. There was a lower number of hours slept (5.75 (5.4; 7.0) vs 7.33 (6.0; 8.0) hours; p = 0.037), and a significantly poorer performance in the PVT (mean reaction time, p = 0.005; Minor lapses, p = 0.009) during the period of classes when compared to the vacation period. There was a correlation between the variation in hours of sleep of the two assessments and a variation in minor lapses in the two assessments (Ro: -0.395; p = 0.011; Spearman's correlation). Students had fewer hours of sleep and more reduced attention during the period of classes than during the vacation period. This decrease in sleeping hours was correlated with more impaired attention.

Prevalence and Cause of Enamel Hypoplasia in Primary Teeth among 1-year-old Japanese Children

Objective: In this study, the prevalence and underlying cause of enamel hypoplasia in one-year-old children were examined. Additionally, to determine the association between enamel hypoplasia and exposure to sunlight based on the frequency of the mother’s outings during pregnancy. Methods: A total of 273 kids (139 boys) were involved in this study. Based on questionnaires surveys to mothers, oral examinations, and photographs of children's mouths, we looked at the connection between the circumstances of pregnancy and the occurrence of enamel hypoplasia. The presence of enamel hypoplasia was assessed using logistic regression analysis differed among the results of the questionnaire. Results: The prevalence of enamel hypoplasia was 38.5%. In the medium and low groups, enamel hypoplasia was more common than in the high group at the birth month of the child (adjusted odds ratio: 3.36, 95% confidence interval: 1.65–6.85, p = 0.001 vs. adjusted odds ratio: 3.76, 95% confidence interval: 1.89–7.48, p < 0.001, respectively). Enamel hypoplasia was knowingly higher among the children whose mothers went out less than 1–2 times a week during pregnancy (adjusted odds ratio: 2.41, 95% confidence interval: 1.04–5.61, p = 0.041). Enamel hypoplasia was significantly more prevalent when mothers used painkillers during pregnancy (adjusted odds ratio: 5.45, 95% Confidence interval: 1.74–17.08, p = 0.004). Conclusion: It was suggested that the use of antipyretic analgesics during pregnancy and frequency of outings and variations in sunshine hours according to the child's birth month could affect the occurrence of enamel hypoplasia.

Rehearsal and Performance Volume in Professional Ballet: A Five-Season Cohort Study.

Few studies have published data concerning the longitudinal rehearsal and performance demands experienced by professional ballet dancers. We aimed to describe the rehearsal and performance volumes undertaken across five professional ballet seasons and identify factors associated with inter-dancer and inter-production variation in dance hours. Scheduling data were collected from 123 dancers over five seasons at The Royal Ballet. Linear mixed effects models were used to evaluate differences in: 1. weekly dance hours and seasonal performance counts across sexes, company ranks, and months; and 2. factors associated with the variation in rehearsal hours required to stage different productions. On average across the five seasons, a peak in performance volume was observed in December, whereas rehearsal hours peaked in October and November and between January and April. Differences in weekly dance hours were observed between company ranks (p < 0.001, range in means: 19.1 to 27.5 hours per week). Seasonal performance counts varied across company ranks (p < 0.001), ranging from 28 (95% CI: 22, 35) in principals to 113 (95% CI: 108, 118) in the rank of artist. Rehearsal durations were considerably greater in preparation for newly created ballets compared with existing ballets (77.8 vs. 37.5 hours). Rehearsal durations were also greater in preparation for longer ballets, with each additional minute of running time associated with a 0.43 hour increase in rehearsal duration (p < 0.001). Full-length ballets, however, were consistently the most time-efficient to stage due to their long performance runs compared with shorter ballets (16.2 vs. 7.4 performances). Training principles such as progressive overload and periodization should be implemented in professional ballet companies to manage the high and variable rehearsal and performance loads.

Religious practice and student performance: Evidence from Ramadan fasting

We investigate how the intensity of Ramadan affects educational outcomes by exploiting spatio-temporal variation in annual fasting hours. Longer fasting hours are related to increases in student performance in a panel of TIMSS test scores (1995–2019) across Muslim countries but not other countries. Results are confirmed in a panel of PISA test scores (2003–2018) allowing within country-wave comparisons of Muslim to non-Muslim students across Europe. We provide evidence that a demanding Ramadan affects PISA test scores of Muslim students only in cohorts with a large share of co-religionists. This finding is consistent with the hypothesis that shared experiences during more intensive Ramadans facilitate the formation of social capital and a social identity conducive to learning outcomes.

The Influence of Seasonal Cloud Cover, Ambient Temperature and Seasonal Variations in Daylight Hours on the Optimal PV Panel Tilt Angle in the United States

A variety of variables influence the optimal tilt angle of a PV panel, including the characteristics of the panel, the local seasonal weather variations, the number of daylight hours the panel is exposed to and the ambient temperature of the surroundings. In this study, the optimal PV tilt angle and maximum energy output of PV arrays was calculated for every county in the United States and compared against the practice of setting the PV tilt angle to be equivalent to the latitude angle of the PV geographic location. A PVWatts API, implemented through Python, was used in conjunction with the SciPy optimization package to find the optimal tilt angle for each county using a direct line search algorithm. Most counties (95.8%) showed a difference between the location latitude and the optimal tilt of more than one degree. Many counties showed a deviation of 2–6° lower than the location latitude. The variation of daylight hours had the largest influence on tilt angle and seasonal cloud cover and ambient temperature had varying levels of influence. Generally, winter cloud cover decreased the optimal tilt angle whereas high summer temperatures increased the tilt angle.

Consumption and hours in the United States and Europe

We document large differences between the United States and Europe in allocations of expenditures and time for both market and home activities. Using a life-cycle model with home production and endogenous retirement, we find that the cross-country differences in consumption tax, social security system, income tax, and TFP together can account for 68–95% of the cross-country variations in aggregate hours and expenditures. These factors can also account well for the cross-country differences in allocations by age and generate substantially lower market hours in Europe for the age group of sixty and above as in the data. All the factors, except income tax, are quantitatively important for determining cross-country differences in expenditure allocations. While the differences in social security system and income tax are crucial in explaining the difference in market hours around retirement ages, TFP and consumption tax are more important for the difference in market hours for prime ages.

Teaching at university

ABSTRACT Using the rights contained in the Freedom of Information Act, we collected data on the teaching undertaken by staff at 52 UK universities. In contrast to workload modelling, our data reveals the extent of the variation in contact hours by institution, subject, and seniority. We provide for the first time an accurate measure of the teaching undertaken by staff on different contract types. One of our findings is that few universities employ full-time Teaching-only staff. It is some of the most prestigious universities that are leading the way in promoting this specialisation, with important implications for teaching and research.

The Effect of School-Year Employment on Cognitive Skills, Risky Behavior, and Educational Achievement

We estimate the causal effect of hours of employment during the final year of compulsory school on cognitive skills, risky behavior, and educational achievement. The effect is identified by exploiting variation in hours of school-year employment between employed twins and estimation of a value-added model using administrative registers. Increasing hours of school-year employment increases grades in the school exit exams, reduces juvenile delinquency in the following year, and increases the years of schooling attained by age 20. If anything, increasing hours of school-year employment reduces school dropout and school absence. Our results are consistent with a non-linear effect of employment intensity on educational achievement and employment being preventive of risky behavior.

Unequal but balanced: Highly educated mothers' perceptions of work-life balance during the COVID-19 lockdown in Finland and the Netherlands.

One year after the European work–life balance directive, which recognises the need for work–family policy support, measures to slow the spread of the COVID-19 pandemic began shaping parents’ work–life balance in significant ways. Academically, we are challenged to explore whether existing theoretical frameworks hold in this new environment with combined old and new policy frameworks. We are also challenged to understand the nuanced ways in which the first lockdown affects the combination of paid work and care. We address both of these issues, providing a cross-sectional comparative analysis of highly educated mothers’ perceptions of work–life balance during the COVID-19 pandemic in Finland and the Netherlands. Our findings show that highly educated Finnish mothers have more difficulty combining work and care during the first lockdown than Dutch mothers. The absence of state-provided care during the lockdown creates greater difficulty for full-time working Finnish mothers in a dual-earner/state-carer system than an absence of such care in the Dutch one-and-a-half earner system, where most mothers work part time. Further analyses suggest variation in part-time and (nearly) full-time hours mitigates the work–life balance experiences of highly educated Dutch mothers. Additional factors explaining cross-country variation or similarities include the presence of young children and the presence of a partner. We discuss these findings in light of current theoretical frameworks and highlight avenues for future research.

Rehearsal and Performance Volume in Professional Ballet: A Five-Season Cohort Study

Introduction: Few studies have published data concerning the longitudinal rehearsal and performance demands experienced by professional ballet dancers. We aimed to describe the rehearsal and performance volumes undertaken across five professional ballet seasons and identify factors associated with inter-dancer and inter-production variation in dance hours. Methods: Scheduling data were collected from 123 dancers over five seasons at The Royal Ballet. Linear mixed effects models were used to evaluate differences in: 1. weekly dance hours and seasonal performance counts across sexes, company ranks, and months; and 2. factors associated with the variation in rehearsal hours required to stage different productions. Results: On average across the five seasons, a peak in performance volume was observed in December, whereas rehearsal hours peaked in October and November and between January and April. Differences in weekly dance hours were observed between company ranks (p &lt; 0.001, range in means: 19.1 to 27.5 hours per week). Seasonal performance counts varied across company ranks (p &lt; 0.001), ranging from 28 (95% CI: 22, 35) in principals to 113 (95% CI: 108, 118) in the rank of artist. Rehearsal durations were considerably greater in preparation for newly created ballets compared with existing ballets (77.8 vs. 37.5 hours). Rehearsal durations were also greater in preparation for longer ballets, with each additional minute of running time associated with a 0.43 hour increase in rehearsal duration (p &lt; 0.001). Full-length ballets, however, were consistently the most time-efficient to stage due to their long performance runs compared with shorter ballets (16.2 vs. 7.4 performances).Conclusions: Training principles such as progressive overload and periodization should be implemented in professional ballet companies to manage the high and variable rehearsal and performance loads.

Remarkably coherent population structure for a dominant Antarctic Chlorobium species

BackgroundIn Antarctica, summer sunlight enables phototrophic microorganisms to drive primary production, thereby “feeding” ecosystems to enable their persistence through the long, dark winter months. In Ace Lake, a stratified marine-derived system in the Vestfold Hills of East Antarctica, a Chlorobium species of green sulphur bacteria (GSB) is the dominant phototroph, although its seasonal abundance changes more than 100-fold. Here, we analysed 413 Gb of Antarctic metagenome data including 59 Chlorobium metagenome-assembled genomes (MAGs) from Ace Lake and nearby stratified marine basins to determine how genome variation and population structure across a 7-year period impacted ecosystem function.ResultsA single species, Candidatus Chlorobium antarcticum (most similar to Chlorobium phaeovibrioides DSM265) prevails in all three aquatic systems and harbours very little genomic variation (≥ 99% average nucleotide identity). A notable feature of variation that did exist related to the genomic capacity to biosynthesize cobalamin. The abundance of phylotypes with this capacity changed seasonally ~ 2-fold, consistent with the population balancing the value of a bolstered photosynthetic capacity in summer against an energetic cost in winter. The very high GSB concentration (> 108 cells ml−1 in Ace Lake) and seasonal cycle of cell lysis likely make Ca. Chlorobium antarcticum a major provider of cobalamin to the food web. Analysis of Ca. Chlorobium antarcticum viruses revealed the species to be infected by generalist (rather than specialist) viruses with a broad host range (e.g., infecting Gammaproteobacteria) that were present in diverse Antarctic lakes. The marked seasonal decrease in Ca. Chlorobium antarcticum abundance may restrict specialist viruses from establishing effective lifecycles, whereas generalist viruses may augment their proliferation using other hosts.ConclusionThe factors shaping Antarctic microbial communities are gradually being defined. In addition to the cold, the annual variation in sunlight hours dictates which phototrophic species can grow and the extent to which they contribute to ecosystem processes. The Chlorobium population studied was inferred to provide cobalamin, in addition to carbon, nitrogen, hydrogen, and sulphur cycling, as critical ecosystem services. The specific Antarctic environmental factors and major ecosystem benefits afforded by this GSB likely explain why such a coherent population structure has developed in this Chlorobium species.FJebgLEuwcBu4fPtsFrHHTVideo abstract

Social Jetlag and Cardiometabolic Risk in Preadolescent Children.

Objective: Childhood cardiometabolic disease risk (CMD) has been associated with short sleep duration. Its relationship with other aspects of sleep should also be considered, including social jetlag (SJL) which represents the difference between a person's social rhythms and circadian clock. This study investigated whether childhood CMD risk is associated with sleep duration, sleep disturbances, and SJL.Study Design: The observational study included 332 children aged 8–10 years (48.5% female). The three independent variables were sleep duration, sleep disturbances, and SJL. SJL was calculated as the variation in hours between the midpoint of sleep during free (weekend) days and work/school days. Eleven cardiometabolic biomarkers were measured, including central blood pressure, lipids, glycated hemoglobin, arterial wave reflection, and glucose. Underlying CMD risk factors were identified using factor analysis.Results: Four underlying CMD risk factors were identified using factor analysis: blood pressure, cholesterol, vascular health, and carbohydrate metabolism. Neither sleep disturbances nor sleep duration were significantly associated with any of the four CMD factors following adjustments to potential confounders. However, SJL was significantly linked to vascular health (p = 0.027) and cholesterol (p = 0.025).Conclusion: These findings suggest that SJL may be a significant and measurable public health target for offsetting negative CMD trajectories in children. Further studies are required to determine biological plausibility.

Influence of Service Levels and COVID-19 on Water Supply Inequalities of Community-Managed Service Providers in Nepal

In Nepal, there are three types of water service providers; two types of government-managed service providers covering urban and municipal areas, and community-managed service providers called Water Users and Sanitation Associations (WUSAs). This study aims to assess the current water supply service levels and water supply inequalities of WUSAs in terms of water consumption, supply hours, and customer satisfaction. Among the three types of water service providers, WUSAs offered the best performance in terms of their low non-revenue water (NRW) rates and production costs, high bill collection rates, and long supply hours. During the COVID-19 lockdown, water consumption increased, but bill payment notably decreased, possibly due to restricted movement and hesitation by customers to make payments. The multiple-year water consumption variations illustrated the uneven water consumption behavior of customers. Despite the variation in water supply hours, Lorenz curves, Gini coefficients (G), and water consumption analysis depicted low inequalities (G ≈ 0.20–0.28) and adequate water consumption among WUSAs even in 2019–2020. In the three WUSAs, more than 90%, 74%, and 38% of customers consumed water above the basic, medium, and high levels, respectively. Thus, maintaining high service levels of WUSAs is instrumental in achieving Goal 6 of the Sustainable Development Goals (SDGs) in Nepal.