Impact of Covid-19 on the Performance of The Nigeria`s Stock Market

This study identifies the structural break date in the series of All Share Index (ASI) of the Nigeria’s capital market using innovational outlier methodology with the Augmented Dickey-Fuller unit root with structural break test. The study also examines the descriptive characteristics and model structure of ASI before and after the identified break date using ARIMA methodology. It uses daily data of ASI from November 27, 2018 to November 24, 2020. The results indicate that the break date is March 6, 2020. The mean results decreased after the break. The series before the break follows ARIMA (3,1,12), while it follows ARIMA (7,1,9) after the break. The diagnostic test revealed that the ARIMA (7,1,9) fails to capture the entire variation in the series. The modified model for post break period is AR(7), MA(8) and MA(9) process. However, the estimated volatility of the series decreased after the break. The study recommends that capital market studies and policies going forward should incorporate the impact of Covid-19 induced structural break.

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The time-varying effects of oil prices on oil–gas stock returns of the fragile five countries

Financial Innovation ◽

10.1186/s40854-020-00224-y ◽

2021 ◽

Vol 7 (1) ◽

Author(s):

Begüm Yurteri Kösedağlı ◽

Gül Huyugüzel Kışla ◽

A. Nazif Çatık

Keyword(s):

Stock Returns ◽

Positive Impact ◽

Structural Break ◽

Oil Prices ◽

Time Varying ◽

Asset Pricing Model ◽

Daily Data ◽

Structural Break Test ◽

The Impact ◽

Oil Gas

AbstractThis study analyzes oil price exposure of the oil–gas sector stock returns for the fragile five countries based on a multi-factor asset pricing model using daily data from 29 May 1996 to 27 January 2020. The endogenous structural break test suggests the presence of serious parameter instabilities due to fluctuations in the oil and stock markets over the period under study. Moreover, the time-varying estimates indicate that the oil–gas sectors of these countries are riskier than the overall stock market. The results further suggest that, except for Indonesia, oil prices have a positive impact on the sectoral returns of all markets, whereas the impact of the exchange rates on the oil–gas sector returns varies across time and countries.

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Resilience and vulnerability of maternity services in Zimbabwe: a comparative analysis of the effect of Covid-19 and lockdown control measures on maternal and perinatal outcomes, a single-centre cross-sectional study at Mpilo Central Hospital

BMC Pregnancy and Childbirth ◽

10.1186/s12884-021-03884-5 ◽

2021 ◽

Vol 21 (1) ◽

Author(s):

Clare Shakespeare ◽

Handsome Dube ◽

Sikhangezile Moyo ◽

Solwayo Ngwenya

Keyword(s):

Perinatal Outcomes ◽

Control Measures ◽

Central Hospital ◽

Cross Sectional ◽

Maternity Services ◽

Before And After ◽

The Mean ◽

Significant Change ◽

The Impact ◽

Mpilo Central Hospital

Abstract Background On the 27th of March 2020 the Zimbabwean government declared the Covid-19 pandemic a ‘national disaster’. Travel restrictions and emergency regulations have had significant impacts on maternity services, including resource stock-outs, and closure of antenatal clinics during the lockdown period. Estimates of the indirect impact of Covid-19 on maternal and perinatal mortality was expected it to be considerable, but little data was yet available. This study aimed to examine the impact of Covid-19 and lockdown control measures on non-Covid outcomes in a government tertiary level maternity unit in Bulawayo, Zimbabwe, by comparing maternal and perinatal morbidity and mortality before, and after the lockdown was implemented. Methods This was a retrospective, observational study, using a cross-sectional design to compare routine monthly maternal and perinatal statistics three months before and after Covid-19 emergency measures were implemented at Mpilo Central Hospital. Results Between January-March and April-June 2020, the mean monthly deliveries reduced from 747.3 (SD ± 61.3) in the first quarter of 2020 to 681.0 (SD ± 17.6) during lockdown, but this was not statistically significant, p = 0.20. The Caesarean section rates fell from a mean of 29.8% (SD ± 1.7) versus 28.0% (SD ± 1.7), which was also not statistically significant, p = 0.18. During lockdown, the percentage of women delivering at Mpilo Central Hospital who were booked at the hospital fell from a mean of 41.6% (SD ± 1.1) to 35.8% (SD ± 4.3) which was statistically significant, p = 0.03. There was no significant change, however, in maternal mortality or severe maternal morbidity (such as post-partum haemorrhage (PPH), uterine rupture, and severe preeclampsia/eclampsia), stillbirth rate or special care baby unit admission. There was an increase in the mean total number of early neonatal deaths (ENND) (mean 18.7 (SD ± 2.9) versus 24.0 (SD ± 4.6), but this was not statistically significant, p = 0.32. Conclusions Overall, maternity services at Mpilo showed resilience during the lockdown period, with no significant change in maternal and perinatal adverse outcomes, with the same number of man-hours worked before and during the lockdown Maternal and perinatal outcomes should continue to be monitored to assess the impact of Covid-19 and the lockdown measures as the pandemic in Zimbabwe unfolds. Further studies would be beneficial to explore women’s experiences and understand how bookings and deliveries at local clinics changed during this time.

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What Is the Impact of Prior Authorization on the Incidence of Pediatric Tonsillectomy?

Otolaryngology ◽

10.1177/0194599820969631 ◽

2020 ◽

pp. 019459982096963

Author(s):

Vanessa F. Torrecillas ◽

Kaden Neuberger ◽

Alexander Ramirez ◽

Paul Krakovitz ◽

Jeremy D. Meier

Keyword(s):

Elective Surgery ◽

Lag Time ◽

Cross Sectional Study ◽

Health Claims ◽

Third Party ◽

Prior Authorization ◽

Cross Sectional ◽

Before And After ◽

The Mean ◽

The Impact

Objective Third-party payers advocate for prior authorization (PA) to reduce overutilization of health care resources. The impact of PA in elective surgery is understudied, especially in cases where evidence-based clinical practice guidelines define operative candidacy. The objective of this study is to investigate the impact of PA on the incidence of pediatric tonsillectomy. Study Design Cross-sectional study. Setting Health claims database from a third-party payer. Methods Any pediatric patient who had evaluation for tonsillectomy from 2016 to 2019 was eligible for inclusion. A time series analysis was used to evaluate the change in incidence of tonsillectomy before and after PA. Lag time from consultation to surgery before and after PA was compared with segmented regression. Results A total of 10,047 tonsillectomy claims met inclusion and exclusion criteria. Female patients made up 51% of claims, and the mean age was 7.9 years. Just 1.5% of claims were denied after PA implementation. There was no change in the incidence of tonsillectomy for all plan types ( P = .1). Increased lag time from consultation to surgery was noted immediately after PA implementation by 2.38 days (95% CI, 0.23-4.54; P = .030); otherwise, there was no significant change over time ( P = .98). Conclusion A modest number of tonsillectomy claims were denied approval after implementation of PA. The value of PA for pediatric tonsillectomy is questionable, as it did not result in decreased incidence of tonsillectomy in this cohort.

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Tracheobronchial Foreign Bodies: The Impact of a Postgraduate Educational Program on Diagnosis, Morbidity, and Treatment

PEDIATRICS ◽

10.1542/peds.70.1.96 ◽

1982 ◽

Vol 70 (1) ◽

pp. 96-98

Author(s):

Marc Puterman ◽

Rafael Gorodischer ◽

Alberto Leiberman

Keyword(s):

Educational Program ◽

Foreign Bodies ◽

Final Diagnosis ◽

Physician Performance ◽

Postgraduate Educational ◽

Before And After ◽

History Of ◽

The Mean ◽

Hospital Days ◽

The Impact

Aspirated foreign bodies (FBs) may remain undetected and cause serious complications. As part of a postgraduate educational program, results of a local survey were presented to the local medical staff in order to increase its awareness of this diagnostic possibility. The present study was carried out in order to evaluate the management of children with tracheobronchial FBs during two 2-year periods, before and after teaching sessions held in December 1976. In comparison with the previous two years during the 1977-1978 period, the percentage of cases in which a positive history of aspiration was obtained increased from 47.6% to 84.0%; the mean number of hospitalizations due to tracheobronchial FBs decreased from 1.9 to 1.04 per infant, and the mean number of hospital days required for final diagnosis decreased from 17.6 to 5.3. The postgraduate educational program had a positive effect on physician performance and patient care.

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A Study of Executive Function in Patients with Chronic Kidney Disease before and after a Single Session of Hemodialysis

Journal of Neurosciences in Rural Practice ◽

10.1055/s-0040-1703961 ◽

2020 ◽

Vol 11 (02) ◽

pp. 250-255

Author(s):

Vasantmeghna S. Murthy ◽

Vedant S. Shukla

Keyword(s):

Chronic Kidney Disease ◽

Kidney Disease ◽

Statistical Tests ◽

T Test ◽

Emotional States ◽

Single Session ◽

Dialysis Unit ◽

Before And After ◽

The Mean ◽

The Impact

Abstract Background Executive functions (EFs) are critical to daily life and sensitive to our physiological functioning and emotional states. The number of people living with chronic kidney disease (CKD) on hemodialysis (HD) globally is increasing steadily. We aimed to determine the impact of a single session of HD on EFs in patients with CKD receiving maintenance HD (MHD). Methods This was a quasi-experimental study conducted at the department of psychiatry and dialysis unit of a tertiary hospital. Patients undergoing MHD underwent screening to rule out delirium, using the Confusion Assessment Method prior to EF testing. The tests of EF used were the Trail-Making Test—Part B (TMT-B) and Frontal Assessment Battery (FAB), both of which were administered before and after a session of HD. Statistical tests used were Wilcoxon matched pairs signed ranks test, paired t-test, single sample t-test, and correlation analyses. Results The mean time taken on TMT-B before HD was 195.36 seconds and after HD, 171.1 seconds; difference is significant (p = 0.0001). The mean FAB score was 13.19 before HD and 14.83 after HD; the difference is significant (p < 0.0001). Significant differences were observed on similarities (p = 0.003), lexical fluency (p = 0.02), and go–no go (p = 0.003) subtests of FAB. Mean TMT-B scores before and after HD differed significantly from that of a reference study (reference TMT-B 150.69 seconds), p = 0.0002 and 0.04, respectively. Conclusion We conclude that patients with CKD on MHD, in general, have worse executive cognitive functioning compared with healthy populations. A session of HD results in significant improvement in these functions.

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P139: The impact of a pancreatitis admission algorithm on emergency department length of stay in a tertiary care academic hospital

CJEM ◽

10.1017/cem.2020.343 ◽

2020 ◽

Vol 22 (S1) ◽

pp. S114-S115

Author(s):

A. Albina ◽

F. Kegel ◽

F. Dankoff ◽

G. Clark

Keyword(s):

Emergency Department ◽

Length Of Stay ◽

Tertiary Care ◽

Physician Satisfaction ◽

Academic Hospital ◽

Before And After ◽

Potential Applicability ◽

The Mean ◽

Algorithm Implementation ◽

The Impact

Background: Emergency department (ED) overcrowding is associated with a broad spectrum of poor medical outcomes, including medical errors, mortality, higher rates of leaving without being seen, and reduced patient and physician satisfaction. The largest contributor to overcrowding is access block – the inability of admitted patients to access in-patient beds from the ED. One component to addressing access block involves streamlining the decision process to rapidly determine which hospital service will admit the patient. Aim Statement: As of Sep 2011, admission algorithms at our institution were supported and formalised. The pancreatitis algorithm clarified whether general surgery or internal medicine would admit ED patients with pancreatitis. We hypothesize that this prior uncertainty delayed the admission decision and prolonged ED length of stay (LOS) for patients with pancreatitis. Our project evaluates whether implementing a pancreatitis admission algorithm at our institution reduced ED time to disposition (TTD) and LOS. Measures & Design: A retrospective review was conducted in a tertiary care academic hospital in Montreal for all adult ED patients diagnosed with pancreatitis from Apr 2010 to Mar 2014. The data was used to plot separate run charts for ED TTD and LOS. Serial measurements of each outcome were used to monitor change and evaluate for special cause variation. The mean ED LOS and TTD before and after algorithm implementation were also compared using the Student's t test. Evaluation/Results: Over four years, a total of 365 ED patients were diagnosed with pancreatitis and 287 (79%) were admitted. The mean ED LOS for patients with pancreatitis decreased following the implementation of an admission algorithm (1616 vs. 1418 mins, p = 0.05). The mean ED TTD was also reduced (1171 vs. 899 mins, p = 0.0006). A non-random signal of change was suggested by a shift above the median prior to algorithm implementation and one below the median following. Discussion/Impact: This project demonstrates that in a busy tertiary care academic hospital, an admission algorithm helped reduce ED TTD and LOS for patients with pancreatitis. This proves especially valuable when considering the potential applicability of such algorithms to other disease processes, such as gastrointestinal bleeding and congestive heart failure, among others. Future studies demonstrating this external applicability, and the impact of such decision algorithms on physician decision fatigue and within non-academic institutions, proves warranted.

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Exercise right heart catheterisation before and after pulmonary endarterectomy in patients with chronic thromboembolic disease

European Respiratory Journal ◽

10.1183/13993003.00458-2018 ◽

2018 ◽

Vol 52 (3) ◽

pp. 1800458 ◽

Cited By ~ 10

Author(s):

Stefan Guth ◽

Christoph B. Wiedenroth ◽

Andreas Rieth ◽

Manuel J. Richter ◽

Ekkehard Gruenig ◽

...

Keyword(s):

Pulmonary Hypertension ◽

Thromboembolic Disease ◽

Pulmonary Endarterectomy ◽

Right Heart ◽

Heart Catheterisation ◽

Right Heart Catheterisation ◽

Before And After ◽

The Mean ◽

Chronic Thromboembolic Disease ◽

The Impact

Symptomatic patients with chronic thromboembolic disease (CTED) without pulmonary hypertension often show an excessive increase in mean pulmonary arterial pressure (MPAP) during exercise.We report on the impact of pulmonary endarterectomy (PEA) on pulmonary haemodynamics in a prospective series of 32 consecutive CTED patients who underwent PEA. All patients had a comprehensive diagnostic work-up including right heart catheterisation at baseline and 12 months after PEA. Furthermore, in 12 patients exercise right heart catheterisation was performed before and after PEA.After PEA, MPAP was lower at rest (20±3 versus 17±3 mmHg; p=0.008) and during maximal exercise (39±8 versus 31±6 mmHg; p=0.016). The mean total pulmonary resistance (TPR) decreased from 3.6±0.8 Wood Units (WU) pre-operatively to 2.7±0.7 WU 1 year after PEA (p=0.004) and the mean slope of the MPAP/cardiac output (CO) relationship decreased from 3.6±1.0 to 2.3±0.8 WU (p=0.002). Peak oxygen uptake increased from 1.2±0.4 to 1.5±0.3 L·min−1 (p=0.014) and ventilatory equivalents of carbon dioxide decreased from 39±2 to 30±2 (p=0.002). There was a significant improvement in quality of life assessed by the Cambridge Pulmonary Hypertension Outcome Review questionnaire.In CTED patients, PEA resulted in haemodynamic and clinical improvements. The means of TPR and MPAP/CO slopes decreased to <3.0 WU.

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Quality of Life before and after Sleeve Gastrectomy in Lebanese Population

Journal of Obesity ◽

10.1155/2019/1952538 ◽

2019 ◽

Vol 2019 ◽

pp. 1-6

Author(s):

Marwan Alkassis ◽

Fady Gh Haddad ◽

Joseph Gharios ◽

Roger Noun ◽

Ghassan Chakhtoura

Keyword(s):

Quality Of Life ◽

Bariatric Surgery ◽

Weight Loss ◽

Sleeve Gastrectomy ◽

Sexual Pleasure ◽

Life Questionnaire ◽

Before And After ◽

The Mean ◽

The Impact

Introduction. Obesity is increasing worldwide and in Lebanon with a negative impact on the quality of life. The primary objective of this study is to measure the quality of life in obese subjects before and after bariatric surgery, depending on age, sex, and degree of weight loss. A secondary objective is to determine the impact of bariatric surgery on comorbidities associated with obesity. Materials and methods. Patients undergoing laparoscopic sleeve gastrectomy for BMI ≥ 30 kg/m2 between August 2016 and April 2017 were included. Participants completed the Moorehead-Ardelt Quality of Life Questionnaire II (MA II) prior to operation and one year after. Statistical analysis was carried out using SPSS statistics version 20.0. Results. 75 patients participated in the study. The majority were women (75%), and the mean age was 36.3 years. The mean weight loss was 36.57 kg (16–76). Initially, the total MA II score was −0.33 ± 0.93. Postoperatively, it increased to 1.68 ± 0.62 (p≤0.001). All MA II parameters improved after surgery (p≤0.001), but this improvement was independent of age and sex. Improvement in self-esteem, physical activity, work performance, and sexual pleasure was influenced by the degree of weight loss (p≤0.001). All comorbidities associated with obesity regressed significantly after sleeve gastrectomy (p<0.05) with the exception of gastroesophageal reflux and varicose veins of the lower limbs. Conclusion. Sleeve gastrectomy improves quality of life and allows reduction of comorbidities.

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Seawater desalination and serum magnesium concentrations in Israel

Journal of Water and Health ◽

10.2166/wh.2016.164 ◽

2016 ◽

Vol 15 (2) ◽

pp. 296-299 ◽

Cited By ~ 7

Author(s):

Gideon Koren ◽

Meital Shlezinger ◽

Rachel Katz ◽

Varda Shalev ◽

Yona Amitai

Keyword(s):

Serum Magnesium ◽

Large Population ◽

Population Based ◽

Morbidity And Mortality ◽

Population Based Study ◽

Cardiac Morbidity ◽

Before And After ◽

The Mean ◽

Magnesium Status ◽

The Impact

With increasing shortage of fresh water globally, more countries are consuming desalinated seawater (DSW). In Israel >50% of drinking water is now derived from DSW. Desalination removes magnesium, and hypomagnesaemia has been associated with increased cardiac morbidity and mortality. Presently the impact of consuming DSW on body magnesium status has not been established. We quantified changes in serum magnesium in a large population based study (n = 66,764), before and after desalination in regions consuming DSW and in regions where DSW has not been used. In the communities that switched to DSW in 2013, the mean serum magnesium was 2.065 ± 0.19 mg/dl before desalination and fell to 2.057 ± 0.19 mg/dl thereafter (p < 0.0001). In these communities 1.62% of subjects exhibited serum magnesium concentrations ≤1.6 mg/dl between 2010 and 2013. This proportion increased by 24% between 2010–2013 and 2015–2016 to 2.01% (p = 0.0019). In contrast, no such changes were recorded in the communities that did not consume DSW. Due to the emerging evidence of increased cardiac morbidity and mortality associated with hypomagnesaemia, it is vital to consider re-introduction of magnesium to DSW.

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EUROPEAN FISCAL DISCIPLINE BEFORE AND AFTER EMU: CRASH DIET OR PERMANENT WEIGHT LOSS?

Macroeconomic Dynamics ◽

10.1017/s1365100507070204 ◽

2008 ◽

Vol 12 (3) ◽

pp. 404-424 ◽

Cited By ~ 16

Author(s):

ANDREW HUGHES HALLETT ◽

JOHN LEWIS

Keyword(s):

Weight Loss ◽

Structural Breaks ◽

Structural Break ◽

Fiscal Policies ◽

Dynamic Effects ◽

Fiscal Discipline ◽

Stability Pact ◽

Before And After ◽

Structural Break Test ◽

The Stability

This paper studies the evolution of European fiscal policies in three periods: the pre-Maastricht phase (to 1991); the runup to monetary union (1992–1997), and the stability pact phase (1998 onward). Using three separate indicators, we search for structural breaks that could signify a change in the average level of discipline in these periods. We find increased fiscal discipline only up to 1997. We conclude the new fiscal discipline was a temporary phenomenon, a product of the sanction of being denied entry to the Euro. After EMU, fiscal policy gradually loosened. A single structural break test will miss these dynamic effects, and could easily generate the false conclusion that fiscal discipline had tightened since the start of phase two of EMU.

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