scholarly journals Meta-Analysis of Yield Response of Hybrid Field Corn to Foliar Fungicides in the U.S. Corn Belt

2011 ◽  
Vol 101 (9) ◽  
pp. 1122-1132 ◽  
Author(s):  
P. A. Paul ◽  
L. V. Madden ◽  
C. A. Bradley ◽  
A. E. Robertson ◽  
G. P. Munkvold ◽  
...  
Keyword(s):  
United States ◽  
Disease Severity ◽  
Meta Analysis ◽  
The United States ◽  
Yield Response ◽  
Foliar Disease ◽  
Yield Increase ◽  
Field Corn ◽  
Yield Difference ◽  
Meta Analyses

The use of foliar fungicides on field corn has increased greatly over the past 5 years in the United States in an attempt to increase yields, despite limited evidence that use of the fungicides is consistently profitable. To assess the value of using fungicides in grain corn production, random-effects meta-analyses were performed on results from foliar fungicide experiments conducted during 2002 to 2009 in 14 states across the United States to determine the mean yield response to the fungicides azoxystrobin, pyraclostrobin, propiconazole + trifloxystrobin, and propiconazole + azoxystrobin. For all fungicides, the yield difference between treated and nontreated plots was highly variable among studies. All four fungicides resulted in a significant mean yield increase relative to the nontreated plots (P < 0.05). Mean yield difference was highest for propiconazole + trifloxystrobin (390 kg/ha), followed by propiconazole + azoxystrobin (331 kg/ha) and pyraclostrobin (256 kg/ha), and lowest for azoxystrobin (230 kg/ha). Baseline yield (mean yield in the nontreated plots) had a significant effect on yield for propiconazole + azoxystrobin (P < 0.05), whereas baseline foliar disease severity (mean severity in the nontreated plots) significantly affected the yield response to pyraclostrobin, propiconazole + trifloxystrobin, and propiconazole + azoxystrobin but not to azoxystrobin. Mean yield difference was generally higher in the lowest yield and higher disease severity categories than in the highest yield and lower disease categories. The probability of failing to recover the fungicide application cost (ploss) also was estimated for a range of grain corn prices and application costs. At the 10-year average corn grain price of $0.12/kg ($2.97/bushel) and application costs of $40 to 95/ha, ploss for disease severity <5% was 0.55 to 0.98 for pyraclostrobin, 0.62 to 0.93 for propiconazole + trifloxystrobin, 0.58 to 0.89 for propiconazole + azoxystrobin, and 0.91 to 0.99 for azoxystrobin. When disease severity was >5%, the corresponding probabilities were 0.36 to 95, 0.25 to 0.69, 0.25 to 0.64, and 0.37 to 0.98 for the four fungicides. In conclusion, the high ploss values found in most scenarios suggest that the use of these foliar fungicides is unlikely to be profitable when foliar disease severity is low and yield expectation is high.

Culture and Self-Esteem Over Time

2017 ◽  
Vol 8 (8) ◽  
pp. 904-909 ◽  
Author(s):  
Takeshi Hamamura ◽  
Berlian Gressy Septarini
Keyword(s):  
United States ◽  
High School Students ◽  
Cultural History ◽  
Meta Analysis ◽  
The United States ◽  
Self Esteem ◽  
School Students ◽  
Social Ecological ◽  
Ecological Shifts ◽  
Meta Analyses

Self-esteem is increasing in the United States according to temporal meta-analyses of the Rosenberg Self-Esteem Scale. However, it remains unclear whether this trend reflects broad social ecological shifts toward urban, affluent, and technologically advanced or a unique cultural history. A temporal meta-analysis of self-esteem was conducted in Australia. Australia shares social ecological and cultural similarities with the United States. On the other hand, Australian culture is horizontally individualistic and places a stronger emphasis on self-other equality compared to American culture. For this reason, the strengthening norm of positive self-esteem found in the United States may not be evident in Australia. Consistent with this possibility, the findings indicated that self-esteem among Australian high school students, university students, and community participants did not change between 1978 and 2014.

Meta-analysis of soybean yield response to foliar fungicides evaluated from 2005 to 2018 in the United States and Canada

Plant Disease ◽  
2020 ◽  
Author(s):  
Yuba Raj Kandel ◽  
Catherine L. Hunt ◽  
Keith A Ames ◽  
Nicholas Arneson ◽  
Carl Bradley ◽  
...  
Keyword(s):  
Meta Analysis ◽  
Random Effect ◽  
The United States ◽  
Field Trials ◽  
Yield Response ◽  
Application Date ◽  
Economic Analyses ◽  
Meta Analyses ◽  
Yield Responses ◽  
Spray Control

Random-effect meta-analyses were performed on data from 240 field trials conducted between 2005 and 2018 across nine U.S. states and Ontario, Canada, to quantify the yield response of soybean after application of foliar fungicides at beginning pod (R3). Meta-analysis showed that the overall mean yield response when fungicide was used compared to not applying a fungicide was 2.7% (110 kg/ha). Moderator variables were also investigated and included fungicide group, growing season, planting date, and base yield, which all significantly influenced the yield response. There was also evidence that precipitation from the time of planting to the R3 growth stage influenced yield when fungicide was used (P = 0.059). Fungicides containing a premix of active ingredients from multiple groups (either two or three ingredients) increased the yield by 3.0% over not applying a fungicide. The highest and lowest yield responses were observed in 2005 and 2007, respectively. Better yield response to fungicides (a 3.0% increase) occurred when soybeans were planted not later than 21 May and when total precipitation between planting and the R3 application date was above historic averages. Temperatures during the season did not influence the yield response . Yield response to fungicide was higher (a 4.7% increase) in average yield category (no spray control yield 2878 to 3758 kg/ha) and then gradually decreased with increasing base yield. Partial economic analyses indicated that use of foliar fungicides is less likely to be profitable when foliar diseases are absent or at low levels.

The Evaluation of Reemployment Programs: Between Impact Assessment and Theory-Based Approaches

2014 ◽  
Author(s):  
Arie Glebbeek ◽  
Els Sol
Keyword(s):  
United States ◽  
Evaluation Method ◽  
Evaluation Studies ◽  
Meta Analysis ◽  
Evaluation Research ◽  
The United States ◽  
Black Box ◽  
Evaluation Report ◽  
Mediating Mechanisms ◽  
Meta Analyses

In spite of a much improved labor market, the outcome of a leading evaluation report on reemployment programs in the Netherlands turned out negative. This result might be due to limitations of the evaluation method used by the researchers, who had to content themselves with a nonexperimental approach. Currently, for many evaluation researchers, the experimental method stands out as the superior design, especially when combined with a meta-analysis over several trials. We show, however, that experimental evaluations do not solve the uncertainties in this field. Meta-analyses of evaluation studies in Europe and the United States produced strikingly mixed results. Efforts to trace their diversity to variations in reemployment programs have not been very successful. This is mainly because of the “black box character” of many experimental evaluations, which offer little information about the content of the programs. Following “realistic evaluation,” we argue for a focus on the theories behind these programs in evaluation research. To this end, reemployment services are depicted in twelve core (mediating) mechanisms.

scholarly journals Meta-analysis of yield response of foliar fungicide-treated hybrid corn in the United States and Ontario, Canada

PLoS ONE ◽  
2019 ◽  
Vol 14 (6) ◽  
pp. e0217510 ◽  
Author(s):  
Kiersten A. Wise ◽  
Damon Smith ◽  
Anna Freije ◽  
Daren S. Mueller ◽  
Yuba Kandel ◽  
...  
Keyword(s):  
United States ◽  
Meta Analysis ◽  
The United States ◽  
Yield Response ◽  
Hybrid Corn ◽  
Foliar Fungicide

scholarly journals Epidemiological evidence on extra-medical use of prescription pain relievers: transitions from newly incident use to dependence among 12–21 year olds in the United States using meta-analysis, 2002–13

PeerJ ◽  
2015 ◽  
Vol 3 ◽  
pp. e1340 ◽  
Author(s):  
Maria A. Parker ◽  
James C. Anthony
Keyword(s):  
United States ◽  
Opioid Dependence ◽  
Meta Analysis ◽  
The United States ◽  
Standardized Assessments ◽  
Treatment Services ◽  
The Us ◽  
Nationally Representative ◽  
Meta Analyses ◽  
Prescription Pain Relievers

Background.When 12-to-21-year-olds start using prescription pain relievers extra-medically, some of them transition into opioid dependence within 12 months after such use. Our main aim for this epidemiological research on 12-to-21-year-olds in the United States (US) is to estimate the risk of becoming a newly incident case of opioid dependence within 12 months after onset of using prescription pain relievers extra-medically (EMPPR).Methods.Meta-analyses from multiple independent replication samples now are possible, based upon nationally representative survey samples of US adolescents age 12–21 years. All 12-to-21-year-olds were sampled and recruited for the US National Surveys on Drug Use and Health, with standardized assessments of EMPPR use and opioid dependence (NSDUH, 2002–2013).Results.Peak risk for a transition from start of EMPPR use to opioid dependence within 12 months is seen at mid-adolescence among 14-to-15-year-olds (6.3%, 8.7% per year), somewhat earlier than peak risk for starting EMPPR use (seen for 16-to-19-year-olds at 4.1%, 5.9% per year). Applied to 12-to-21-year-olds in the US between 2002–2013, an estimated 8 million started using PPR extra-medically. Each year, roughly 42,000 to 58,000 transitioned into opioid dependence within 12 months after onset of such use.Discussion.These epidemiological estimates for the US in recent years teach us to expect one transition into adolescent-onset opioid dependence within 12 months for every 11–16 newly incident EMPPR users, yielding perhaps 120 newly incident opioid dependent cases in need of practitioner attention or treatment services, each day of each year. This evidence can be used to motivate more effective public health prevention, outreach, and early intervention programs as might prevent or delay occurrence of EMPPR use and opioid dependence.

Meta-Analysis of Parental Involvement and Achievement in East Asian Countries

2019 ◽  
Vol 52 (2) ◽  
pp. 312-337 ◽  
Author(s):  
Sung won Kim
Keyword(s):  
United States ◽  
Parental Involvement ◽  
Meta Analysis ◽  
East Asian ◽  
Policy Issue ◽  
Positive Association ◽  
The United States ◽  
Academic Socialization ◽  
Asian Countries ◽  
Meta Analyses

Countless meta-analytic studies document the relation between parental involvement and achievement, but they mostly include studies conducted in the United States where parental involvement is framed as a policy issue. This is the first meta-analytic study focusing on East Asian countries characterized by high achievement levels, a comparatively standardized education system, and no policy encouraging family–school relations. A meta-analysis of 15 studies retrieved from an exhaustive search of the literature reveals a positive association between parental involvement and achievement. The strength of the relation was highest for academic socialization, followed by home involvement and school involvement, similar to previous meta-analyses.

Proportion of Individuals With Past-Year Suicidal Ideation Who Attempted Suicide Over the Past 10 Years in the United States, and the Influence of Age and Sex

Crisis ◽  
2020 ◽  
pp. 1-5
Author(s):  
Shannon Lange ◽  
Courtney Bagge ◽  
Charlotte Probst ◽  
Jürgen Rehm
Keyword(s):  
United States ◽  
Suicidal Ideation ◽  
Random Effects ◽  
Attempted Suicide ◽  
Suicide Attempts ◽  
The United States ◽  
Individual Level ◽  
The Past ◽  
Meta Analyses ◽  
Age Category

Abstract. Background: In recent years, the rate of death by suicide has been increasing disproportionately among females and young adults in the United States. Presumably this trend has been mirrored by the proportion of individuals with suicidal ideation who attempted suicide. Aim: We aimed to investigate whether the proportion of individuals in the United States with suicidal ideation who attempted suicide differed by age and/or sex, and whether this proportion has increased over time. Method: Individual-level data from the National Survey on Drug Use and Health (NSDUH), 2008–2017, were used to estimate the year-, age category-, and sex-specific proportion of individuals with past-year suicidal ideation who attempted suicide. We then determined whether this proportion differed by age category, sex, and across years using random-effects meta-regression. Overall, age category- and sex-specific proportions across survey years were estimated using random-effects meta-analyses. Results: Although the proportion was found to be significantly higher among females and those aged 18–25 years, it had not significantly increased over the past 10 years. Limitations: Data were self-reported and restricted to past-year suicidal ideation and suicide attempts. Conclusion: The increase in the death by suicide rate in the United States over the past 10 years was not mirrored by the proportion of individuals with past-year suicidal ideation who attempted suicide during this period.

A Systematic Review on Barriers to Palliative Care in Oncology

2021 ◽  
pp. 104990912098328
Author(s):  
Jyotsana Parajuli ◽  
Judith E. Hupcey
Keyword(s):  
United States ◽  
Systematic Review ◽  
Palliative Care ◽  
Full Text ◽  
Literature Search ◽  
Intervention Development ◽  
The United States ◽  
Care Utilization ◽  
Review Of Literature ◽  
Meta Analyses

The number of people with cancer and the need for palliative care among this population is increasing in the United States. Despite this growing need, several barriers exist to the utilization of palliative care in oncology. The purpose of this study was to synthesize the evidence on the barriers to palliative care utilization in an oncology population. A systematic review of literature was conducted following the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines. PubMed, CINAHL, and Psych Info databases were used for the literature search. Articles were included if they: 1) focused on cancer, (2) examined and discussed barriers to palliative care, and c) were peer reviewed, published in English, and had an accessible full text. A total of 29 studies (8 quantitative, 18 qualitative, and 3 mixed-methods) were identified and synthesized for this review. The sample size of the included studies ranged from 10 participants to 313 participants. The barriers to palliative care were categorized into barriers related to the patient and family, b) barriers related to providers, and c) barriers related to the healthcare system or policy. The factors identified in this review provide guidance for intervention development to mitigate the existing barriers and facilitate the use palliative care in individuals with cancer.

scholarly journals Associations between Greenspace and Gentrification-Related Sociodemographic and Housing Cost Changes in Major Metropolitan Areas across the United States

2021 ◽  
Vol 18 (6) ◽  
pp. 3315
Author(s):  
Leah H. Schinasi ◽  
Helen V. S. Cole ◽  
Jana A. Hirsch ◽  
Ghassan B. Hamra ◽  
Pedro Gullon ◽  
...  
Keyword(s):  
United States ◽  
Census Tract ◽  
Household Income ◽  
The United States ◽  
Effect Modification ◽  
Ethnic Composition ◽  
Housing Cost ◽  
Census Tract Level ◽  
Specific Distribution ◽  
Meta Analyses

Neighborhood greenspace may attract new residents and lead to sociodemographic or housing cost changes. We estimated relationships between greenspace and gentrification-related changes in the 43 largest metropolitan statistical areas (MSAs) of the United States (US). We used the US National Land Cover and Brown University Longitudinal Tracts databases, as well as spatial lag models, to estimate census tract-level associations between percentage greenspace (years 1990, 2000) and subsequent changes (1990–2000, 2000–2010) in percentage college-educated, percentage working professional jobs, race/ethnic composition, household income, percentage living in poverty, household rent, and home value. We also investigated effect modification by racial/ethnic composition. We ran models for each MSA and time period and used random-effects meta-analyses to derive summary estimates for each period. Estimates were modest in magnitude and heterogeneous across MSAs. After adjusting for census-tract level population density in 1990, compared to tracts with low percentage greenspace in 1992 (defined as ≤50th percentile of the MSA-specific distribution in 1992), those with high percentage greenspace (defined as >75th percentile of the MSA-specific distribution) experienced higher 1990–2000 increases in percentage of the employed civilian aged 16+ population working professional jobs (β: 0.18, 95% confidence interval (CI): 0.11, 0.26) and in median household income (β: 0.23, 95% CI: 0.15, 0.31). Adjusted estimates for the 2000–2010 period were near the null. We did not observe evidence of effect modification by race/ethnic composition. We observed evidence of modest associations between greenspace and gentrification trends. Further research is needed to explore reasons for heterogeneity and to quantify health implications.

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