scholarly journals Clinical, Laboratory and Imaging Features of COVID-19: A Systematic Review and Meta-analysis

2020 ◽  
Author(s):  
Alfonso J. Rodriguez-Morales ◽  
Jaime A. Cardona-Ospina ◽  
Estefanía Gutiérrez-Ocampo ◽  
Rhuvi Villamizar-Peña ◽  
Yeimer Holguin-Rivera ◽  
...  
Keyword(s):  
Observational Studies ◽  
Clinical Laboratory ◽  
Case Reports ◽  
Meta Analysis ◽  
Fatal Outcome ◽  
Clinical Manifestations ◽  
Clinical Infectious Disease ◽  
Imaging Features ◽  
Pooled Prevalence ◽  
Quantitative Analyses

Introduction: An epidemic of Coronavirus Disease 2019 (COVID-19) begun in December 2019 in China, causing a Public Health Emergency of International Concern. Among raised questions, clinical, laboratory, and imaging features have been partially characterized in some observational studies. No systematic reviews have been published on this matter. Methods: We performed a systematic literature review with meta-analysis, using three databases to assess clinical, laboratory, imaging features, and outcomes of confirmed cases of COVID-19. All the observational studies, and also case reports, were included and analyzed separately. We performed a random-effects model meta-analysis to calculate the pooled prevalence and 95% confidence interval (95%CI). Measures of heterogeneity were estimated and reported. Results: 660 articles were retrieved. After screening by abstract and title, 27 articles were selected for full-text assessment. Of them, 19 were finally included for qualitative and quantitative analyses. Additionally, 39 case report articles were included and analyzed separately. For 656 patients, fever (88.7%, 95%CI 84.5-92.9%), cough (57.6%, 40.8-74.4%) and dyspnea (45.6%, 10.9-80.4%) were the most prevalent clinical manifestations. Among the patients, 20.3% (95%CI 10.0-30.6%) required intensive care unit (ICU), with 32.8% presenting acute respiratory distress syndrome (ARDS) (95%CI 13.7-51.8), 6.2% (95%CI 3.1-9.3) with shock and 13.9% (95%CI 6.2-21.5%) with a fatal outcome. Discussion: COVID-19 is a new clinical infectious disease, causing considerable compromise, especially in patients with comorbidities, requiring ICU in at least a fifth of them and sometimes with fatal outcomes. Additional research is needed to elucidate factors that may mediate the pathogenesis of the severe and fatal associated disease.

scholarly journals Clinical, Laboratory and Imaging Features of COVID-19: A Systematic Review and Meta-analysis

2020 ◽  
Author(s):  
Alfonso J. Rodriguez-Morales ◽  
Jaime A. Cardona-Ospina ◽  
Estefanía Gutiérrez-Ocampo ◽  
Rhuvi Villamizar-Peña ◽  
Yeimer Holguin-Rivera ◽  
...  
Keyword(s):  
Systematic Review ◽  
Observational Studies ◽  
Clinical Laboratory ◽  
Case Reports ◽  
Meta Analysis ◽  
Clinical Manifestations ◽  
Clinical Infectious Disease ◽  
Primary Concern ◽  
Imaging Features ◽  
Pooled Prevalence

Introduction: An epidemic of Coronavirus Disease 2019 (COVID-19) begun in December 2019 in China, causing primary concern. Among raised questions, clinical, laboratory, and imaging features have been partially characterized in some observational studies. No systematic reviews have been published on this matter. Methods: We performed a systematic review of the literature with meta-analysis, using three databases to assess clinical, laboratory, imaging features, and outcomes of confirmed cases of COVID-19. All the observational studies, and also case reports, were included. The case reports were analyzed separately. We performed a random-effects model meta-analysis to calculate the pooled prevalence and 95%CI. Measures of heterogeneity, including Cochran’s Q statistic, the I2 index, and the τ2 test, were estimated and reported.Results: 660 articles were retrieved. After screening by abstract and title, 27 articles were selected for full-text assessment. Of them, 19 were finally included for qualitative and quantitative analyses. Additionally, 39 case report articles were included and analyzed separately. For >656 patients, fever (88.7%, 95%CI 84.5-92.9%), cough (57.6%, 40.8-74.4%) and dyspnea (45.6%, 10.9-80.4%) were the most prevalent clinical manifestations. Among the patients, 20.3% (95%CI 10.0-30.6%) required ICU, with 32.8% presenting ARDS (95%CI 13.7-51.8), 6.2% (95%CI 3.1-9.3) with shock and 13.9% (95%CI 6.2-21.5%) with a fatal outcome.Discussion: COVID-19 is a new clinical infectious disease, causing considerable compromise, especially in patients with comorbidities, requiring ICU in at least a fifth of them and sometimes with fatal outcomes. Additional research is needed to elucidate factors that may mediate the pathogenesis of the severe and fatal associated disease.

scholarly journals Clinical, Laboratory and Imaging Features of COVID-19: A Systematic Review and Meta-analysis

2020 ◽  
Author(s):  
Alfonso J. Rodriguez-Morales ◽  
Jaime A. Cardona-Ospina ◽  
Estefanía Gutiérrez-Ocampo ◽  
Rhuvi Villamizar-Peña ◽  
Yeimer Holguin-Rivera ◽  
...  
Keyword(s):  
Observational Studies ◽  
Clinical Laboratory ◽  
Case Reports ◽  
Meta Analysis ◽  
Case Fatality ◽  
Imaging Features ◽  
Healthcare Facilities ◽  
Qualitative And Quantitative ◽  
Pooled Prevalence ◽  
Quantitative Analyses

Introduction: An epidemic of Coronavirus Disease 2019 (COVID-19) begun in December 2019 in China, causing a Public Health Emergency of International Concern. Among raised questions, clinical, laboratory, and imaging features have been partially characterized in some observational studies. No systematic reviews have been published on this matter. Methods: We performed a systematic literature review with meta-analysis, using three databases to assess clinical, laboratory, imaging features, and outcomes of COVID-19 confirmed cases. Observational studies, and also case reports, were included and analyzed separately. We performed a random-effects model meta-analysis to calculate the pooled prevalence and 95% confidence interval (95%CI). Results: 660 articles were retrieved (1/1/2020-2/23/2020). After screening by abstract/title, 27 articles were selected for full-text assessment. Of them, 19 were finally included for qualitative and quantitative analyses. Additionally, 39 case report articles were included and analyzed separately. For 656 patients, fever (88.7%, 95%CI 84.5-92.9%), cough (57.6%, 40.8-74.4%) and dyspnea (45.6%, 10.9-80.4%) were the most prevalent manifestations. Among the patients, 20.3% (95%CI 10.0-30.6%) required intensive care unit (ICU), with 32.8% presenting acute respiratory distress syndrome (ARDS) (95%CI 13.7-51.8), 6.2% (95%CI 3.1-9.3) with shock and 13.9% (95%CI 6.2-21.5%) of hospitalized patients with fatal outcomes (case fatality rate, CFR).Conclusion: COVID-19 brings a huge burden to healthcare facilities, especially in patients with comorbidities. ICU was required for approximately 20% of polymorbid, COVID-19 infected patients and this group was associated with a CFR of over 13%. As this virus spreads globally, countries need to urgently prepare human resources, infrastructure, and facilities to treat severe COVID-19.

scholarly journals The Novel Coronavirus Disease (COVID-19): A PRISMA Systematic Review and Meta-Analysis of Clinical and Paraclinical Characteristics

2020 ◽  
Vol 2020 ◽  
pp. 1-16 ◽  
Author(s):  
Hamidreza Hasani ◽  
Shayan Mardi ◽  
Sareh Shakerian ◽  
Nooshin Taherzadeh-Ghahfarokhi ◽  
Parham Mardi
Keyword(s):  
Systematic Review ◽  
Observational Studies ◽  
Clinical Laboratory ◽  
Meta Analysis ◽  
Ct Scanning ◽  
Imaging Features ◽  
The Novel ◽  
Laboratory Findings ◽  
Global Concern ◽  
Novel Coronavirus

An outbreak of pneumonia, caused by a novel coronavirus (SARS-CoV-2), was identified in China in December 2019. This virus expanded worldwide, causing global concern. Although clinical, laboratory, and imaging features of COVID-19 are characterized in some observational studies, we undertook a systematic review and meta-analysis to assess the frequency of these features. We did a systematic review and meta-analysis using three databases to identify clinical, laboratory, and computerized tomography (CT) scanning features of rRT-PCR confirmed cases of COVID-19. Data for 3420 patients from 30 observational studies were included. Overall, the results showed that fever (84.2%, 95% CI 82.6-85.7), cough (62%, 95% CI 60-64), and fatigue (39.4%, 95% CI 37.2-41.6%) are the most prevalent symptoms in COVID-19 patients. Increased CRP level, decreased lymphocyte count, and increased D-dimer level were the most common laboratory findings. Among COVID-19 patients, 92% had a positive CT finding, most prevalently ground-glass opacification (GGO) (60%, 95% CI 58-62) and peripheral distribution opacification (64%, 95% CI 60-69). These results demonstrate the clinical, paraclinical, and imaging features of COVID-19.

scholarly journals Gastrointestinal symptoms and fecal nucleic acid testing of children with 2019 coronavirus disease: a systematic review and meta-analysis

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Ji-gan Wang ◽  
Hai-rong Cui ◽  
Hua-bo Tang ◽  
Xiu-li Deng
Keyword(s):  
Nucleic Acid ◽  
Respiratory Tract ◽  
Case Reports ◽  
Meta Analysis ◽  
Clinical Manifestations ◽  
Gastrointestinal Symptoms ◽  
Nucleic Acid Detection ◽  
Nucleic Acid Testing ◽  
Pooled Prevalence ◽  
Positive Rate

Abstract In order to understand the clinical manifestations and incidence of gastrointestinal symptoms of coronavirus disease (COVID-19) in children and discuss the importance of fecal nucleic acid testing.We retrospectively analyzed studies on gastrointestinal symptoms and fecal nucleic acid detection in pediatric COVID-19 patients from January 1, 2020 to August 10, 2020, including prospective clinical studies and case reports. The results of fecal nucleic acid detection were analyzed systematically. Stata12.0 software was used for meta-analysis.The results showed that the most common gastrointestinal symptoms in children with COVID-19 were vomiting and diarrhea, with a total incidence of 17.7% (95% Cl 13.9–21.5%). However, the prevalence of gastrointestinal symptoms in other countries (21.1%, 95% CI 16.5–25.7%) was higher compared to China (12.9%, 95% CI 8–17.7%). In Wuhan, the pooled prevalence was much higher (41.3%, 95% CI 3.2–79.4%) compared to areas outside Wuhan in China (7.1%, 95% CI 4.0–10.3%). The positive rate of fecal nucleic acid testing in COVID-19 children was relatively high at 85.8% (91/106). Additionally, 71.2% (52/73) were still positive for fecal nucleic acid after respiratory tract specimens turned negative. One and two weeks after the respiratory tract specimens turned nucleic acid-negative, 45.2% (33/73) and 34.2% (25/73) patients, respectively, remained fecal nucleic acid-positive. The longest interval between the respiratory tract specimens turning negative and fecal specimens turning negative exceeded 70 days. Conclusions and relevance: gastrointestinal symptoms in pediatric COVID-19 are relatively common. Attention should be paid to the detection of fecal nucleic acids in children. Fecal nucleic acid-negative status should be considered as one of the desegregation standards.

scholarly journals Clinical features, treatments and outcomes of severe and critical severe patients infected with COVID-19: A system review and meta-analysis

2020 ◽  
Author(s):  
Hai-yue Zhang ◽  
Fang-zhou Jiao ◽  
Xiao-jun Wu ◽  
Min Shang ◽  
Yu-chuan Luo ◽  
...  
Keyword(s):  
Clinical Features ◽  
Clinical Laboratory ◽  
Meta Analysis ◽  
Invasive Mechanical Ventilation ◽  
Cardiac Injury ◽  
Fatal Outcome ◽  
Fixed Effect Model ◽  
Utilization Rate ◽  
Imaging Features ◽  
Multiple Organs

Abstract Backgrounds: The outbreak of COVID-19 caused by a novel coronavirus, SARS-CoV-2, has been listed as a public health emergency of international concern by WHO. Most COVID-19 patients presented with a mild infection, but many challenges exist in therapy of severe and critical severe patients. This paper systematically reviewed clinical features, treatments and outcomes of severe and critical severe patients infected COVID-19. Methods: The clinical, laboratory, imaging features, treatment and outcomes of COVID-19 were collected. The data were analyzed by using STATA 15 statistical software to estimate the prevalence and 95% CI in severe and critical severe patients with COVID-19. A random or fixed effect model was used to estimate the prevalence and 95% CI. Results: After screening, 8 studies including a total of 275 patients were included in this meta-analysis. The percentage of severe and critical severe patients in confirmed COVID-19 cases was 25% (95% CI 16-36%). Fever, cough, dyspnea, lymphopenia and bilateral distribution of patchy shadows were the most prevalent findings in these patients. Utilization rate of antiviral drugs, corticosteroid, non-invasive ventilation, invasive mechanical ventilation was high in therapy strategies. The most prevalent complications were ARDS, shock, and acute cardiac injury. Discussion: Severe and critical severe COVID-19 patients usually had complications even a fatal outcome. As vaccines and anti-coronaviral drugs are under development, the principles of treatment for these patients should be focused on improving oxygenation, lung protective and function support of multiple organs.

scholarly journals Gastrointestinal symptoms and fecal nucleic acid testing of children with 2019 coronavirus disease: a systematic review and meta-analysis

2020 ◽  
Author(s):  
Ji-Gan Wang ◽  
Hairong Cui ◽  
Huabo Tang ◽  
Xiu-li Deng
Keyword(s):  
Nucleic Acid ◽  
Respiratory Tract ◽  
Case Reports ◽  
Meta Analysis ◽  
Clinical Manifestations ◽  
Gastrointestinal Symptoms ◽  
Nucleic Acid Detection ◽  
Nucleic Acid Testing ◽  
Pooled Prevalence ◽  
Positive Rate

Abstract In order to understand the clinical manifestations and incidence of gastrointestinal symptoms of coronavirus disease (COVID-19) in children and discuss the importance of fecal nucleic acid testing.We retrospectively analyzed studies on gastrointestinal symptoms and fecal nucleic acid detection in pediatric COVID-19 patients from January 1, 2020 to August 10, 2020, including prospective clinical studies and case reports. The results of fecal nucleic acid detection were analyzed systematically. Stata12.0 software was used for meta-analysis.The results showed that the most common gastrointestinal symptoms in children with COVID-19 were vomiting and diarrhea, with a total incidence of 17.7% (95% Cl: 13.9%-21.5%). However, the prevalence of gastrointestinal symptoms in other countries (21.1%, 95% CI: 16.5%-25.7%) was higher compared to China (12.9%, 95% CI: 8%-17.7%). In Wuhan, the pooled prevalence was much higher (41.3%, 95 % CI: 3.2%-79.4%) compared to areas outside Wuhan in China (7.1%, 95 % CI: 4.0%-10.3%).The positive rate of fecal nucleic acid testing in COVID-19 children was relatively high at 85.8% (91/106). Additionally, 71.2% (52/73) were still positive for fecal nucleic acid after respiratory tract specimens turned negative. One and two weeks after the respiratory tract specimens turned nucleic acid-negative, 45.2% (33/73) and 34.2% (25/73) patients, respectively, remained fecal nucleic acid-positive. The longest interval between the respiratory tract specimens turning negative and fecal specimens turning negative exceeded 70 days.Conclusions and Relevance:Gastrointestinal symptoms in pediatric COVID-19 are relatively common. Attention should be paid to the detection of fecal nucleic acids in children. Fecal nucleic acid-negative status should be considered as one of the desegregation standards.

scholarly journals Gastrointestinal symptoms and fecal nucleic acid testing of children with coronavirus disease 2019: a systematic review and meta-analysis

2020 ◽  
Author(s):  
Ji-Gan Wang ◽  
Hairong Cui ◽  
Huabo Tang
Keyword(s):  
Nucleic Acid ◽  
Respiratory Tract ◽  
Case Reports ◽  
Meta Analysis ◽  
Clinical Manifestations ◽  
Gastrointestinal Symptoms ◽  
Nucleic Acid Detection ◽  
Nucleic Acid Testing ◽  
Negative Results ◽  
Pooled Prevalence

Abstract Objective: To understand the clinical manifestations and incidence of gastrointestinal symptoms of Coronavirus disease (COVID-19) in children and discuss the importance of fecal nucleic acid testing.Methods: Retrospective analysis of studies of gastrointestinal symptoms and fecal nucleic acid detection in pediatric COVID-19 since the outbreak of COVID-19, as well as prospective clinical studies and case reports to understand the clinical characteristics of gastrointestinal symptoms and feces in children. Nucleic acid detection results were also analyzed.Results: 1. The clinical manifestations of gastrointestinal symptoms in children with COVID-19 are mostly vomiting and diarrhea, with a total incidence rate of 21.1% (95%Cl=0.14-0.28).2.When analyzing by country (studies from China versus studies from other countries), the pooled prevalence of gastrointestinal symptoms in studies from countries other than China was much lower at 18.2% (95% CI0.05 to 0.31). This is in comparison to studies from China where the prevalence was higher: 23.3% (95% CI 0.153 to 0.310) .3.In Wuhan patients, the pooled prevalence was much higher at 41.2% (95 % CI 0.147 to 0.678) as compared to areas outside Wuhan，China：15.1%(95 % CI 0.075 to 0.227).4.Fecal nucleic acid detection is as accurate as respiratory specimen nucleic acid detection. The positive rate of fecal nucleic acid testing in COVID-19 patients was 92.5% (25/27). In patients where nucleic acid tests of respiratory tract specimens produced negative results, a positive fecal nucleic acid test result was present in 83.3% (20/24); one week after the respiratory tract specimen was nucleic acid-negative, 54.1% (13/24) were fecal nucleic acid-positive; two weeks after the respiratory tract nucleic acid negative test, 37.5% (9/24) were fecal nucleic acid-positive. The longest interval between a negative respiratory system result and positive fecal specimen result exceeded 19 days.Conclusions and Relevance: Gastrointestinal symptoms in pediatric COVID-19 are relatively common. Attention should be paid to the detection of fecal nucleic acids in children. Fecal nucleic acid-negative status should be considered as one of the desegregation standards.

scholarly journals The Novel Coronavirus Disease (COVID-19): A PRISMA Systematic Review and Meta-analysis of Clinical and Paraclinical characteristics

2020 ◽  
Author(s):  
Hamidreza Hasani ◽  
Shayan Mardi ◽  
Sareh Shakerian ◽  
Nooshin Taherzadeh-Ghahfarokhi ◽  
Parham Mardi
Keyword(s):  
Systematic Review ◽  
Observational Studies ◽  
Clinical Laboratory ◽  
Meta Analysis ◽  
Imaging Features ◽  
The Novel ◽  
Laboratory Findings ◽  
Global Concern ◽  
Novel Coronavirus ◽  
Ct Features

AbstractAn outbreak of pneumonia, caused by a novel coronavirus (COVID-19) was Identified in China in Dec 2019. This virus expanded worldwide, causing global concern. Clinical, laboratory and imaging features of this infection are characterized in some observational studies. We undertook a systematic review and meta-analysis to assess the frequency of clinical, laboratory, and CT features in COVID-19 patients.We did a systematic review and meta-analysis using three databases to identify clinical, laboratory, and CT features of rRT-PCR confirmed cases of COVID-19. Data for 3420 patients from 30 observational studies were included.Overall, the results showed that fever (84.2%, 95%CI 82.6-85.7), cough (62%, 95%CI 60-64), and fatigue (39.4%, 95%CI 37.2-41.6%) were the most prevalent symptoms in COVID-19 patients. Increased CRP level, decreased lymphocyte count, and increased D-dimer level were the most common laboratory findings. Among COVID-19 patients, 92% had a positive CT finding, most prevalently GGO (60%, 95%CI 58-62) and peripheral distribution (64%, 95%CI 60-69).These results demonstrate the clinical, paraclinical, and imaging features of COIVD-19.

scholarly journals Global Burden Related to Nitrous Oxide Exposure in Medical and Recreational Settings: A Systematic Review and Individual Patient Data Meta-Analysis

2019 ◽  
Vol 8 (4) ◽  
pp. 551 ◽  
Author(s):  
Abderrahim Oussalah ◽  
Mélissa Julien ◽  
Julien Levy ◽  
Olivia Hajjar ◽  
Claire Franczak ◽  
...  
Keyword(s):  
Nitrous Oxide ◽  
Vitamin B12 ◽  
Individual Patient Data ◽  
Clinical Laboratory ◽  
Case Reports ◽  
Meta Analysis ◽  
Clinical Manifestations ◽  
Vitamin B12 Deficiency ◽  
Patient Data ◽  
B12 Deficiency

The risk of adverse effects of nitrous oxide (N2O) exposure is insufficiently recognized despite its widespread use. These effects are mainly reported through case reports. We conducted an individual patient data meta-analysis to assess the prevalence of clinical, laboratory, and magnetic resonance findings in association with N2O exposure in medical and recreational settings. We calculated the pooled estimates for the studied outcomes and assessed the potential bias related to population stratification using principal component analysis. Eighty-five publications met the inclusion criteria and reported on 100 patients with a median age of 27 years and 57% of recreational users. The most frequent outcomes were subacute combined degeneration (28%), myelopathy (26%), and generalized demyelinating polyneuropathy (23%). A T2 signal hyperintensity in the spinal cord was reported in 68% (57.2–78.8%) of patients. The most frequent clinical manifestations included paresthesia (80%; 72.0–88.0%), unsteady gait (58%; 48.2–67.8%), and weakness (43%; 33.1–52.9%). At least one hematological abnormality was retrieved in 71.7% (59.9–83.4%) of patients. Most patients had vitamin B12 deficiency: vitamin B12 <150 pmol/L (70.7%; 60.7–80.8%), homocysteine >15 µmol/L (90.3%; 79.3–100%), and methylmalonic acid >0.4 µmol/L (93.8%; 80.4–100%). Consistently, 85% of patients exhibited a possibly or probably deficient vitamin B12 status according to the cB12 scoring system. N2O can produce severe outcomes, with neurological or hematological disorders in almost all published cases. More than half of them are reported in the setting of recreational use. The N2O-related burden is dominated by vitamin B12 deficiency. This highlights the need to evaluate whether correcting B12 deficiency would prevent N2O-related toxicity, particularly in countries with a high prevalence of B12 deficiency.

scholarly journals Gastrointestinal symptoms and fecal nucleic acid testing of children with 2019 coronavirus disease: a systematic review and meta-analysis

2020 ◽  
Author(s):  
Ji-Gan Wang ◽  
Hairong Cui ◽  
Huabo Tang ◽  
Xiu-li Deng
Keyword(s):  
Nucleic Acid ◽  
Respiratory Tract ◽  
Case Reports ◽  
Meta Analysis ◽  
Clinical Manifestations ◽  
Gastrointestinal Symptoms ◽  
Nucleic Acid Detection ◽  
Nucleic Acid Testing ◽  
Pooled Prevalence ◽  
Positive Rate

Abstract In order to understand the clinical manifestations and incidence of gastrointestinal symptoms of coronavirus disease (COVID-19) in children and discuss the importance of fecal nucleic acid testing.We retrospectively analyzed studies on gastrointestinal symptoms and fecal nucleic acid detection in pediatric COVID-19 patients from January 1, 2020 to August 10, 2020, including prospective clinical studies and case reports. The results of fecal nucleic acid detection were analyzed systematically. Stata12.0 software was used for meta-analysis.The results showed that the most common gastrointestinal symptoms in children with COVID-19 were vomiting and diarrhea, with a total incidence of 17.7% (95% Cl: 13.9%-21.5%). However, the prevalence of gastrointestinal symptoms in other countries (21.1%, 95% CI: 16.5%-25.7%) was higher compared to China (12.9%, 95% CI: 8%-17.7%). In Wuhan, the pooled prevalence was much higher (41.3%, 95 % CI: 3.2%-79.4%) compared to areas outside Wuhan in China (7.1%, 95 % CI: 4.0%-10.3%).The positive rate of fecal nucleic acid testing in COVID-19 children was relatively high at 85.8% (91/106). Additionally, 71.2% (52/73) were still positive for fecal nucleic acid after respiratory tract specimens turned negative. One and two weeks after the respiratory tract specimens turned nucleic acid-negative, 45.2% (33/73) and 34.2% (25/73) patients, respectively, remained fecal nucleic acid-positive. The longest interval between the respiratory tract specimens turning negative and fecal specimens turning negative exceeded 70 days.Conclusions and Relevance:Gastrointestinal symptoms in pediatric COVID-19 are relatively common. Attention should be paid to the detection of fecal nucleic acids in children. Fecal nucleic acid-negative status should be considered as one of the desegregation standards.

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