In search of COVID-19 and stock market behavior

The aim of this paper is two-fold. First, we investigate the nexus between investor attention to COVID-19 and daily returns in 59 countries. We use Google Search Volume Index to account for investor attention. Our empirical findings suggest that the search volume of the pandemic is negatively associated with daily returns. The effect was strong in the week that the World Health Organization declared it as pandemic and among advanced countries. Second, we explore the relationship between search volume and market volatility. The findings suggest that COVID-19 sentiment generated excess volatility in the market. Our findings remain robust with alternative specifications.

Worldwide Interest in Vitamin D, Negative Effects on Kidneys, and Bone Density: Analysis of Google Trends Data

Background: Besides its role in calcium homeostasis and bone mineralization, vitamin D may also reduce the risk of cancer, cardiovascular and autoimmune diseases. Excessive vitamin D intake can lead to life-threatening hypercalcemia and toxicity, however. Here, we wanted to determine the relative search volume (RSV) of interest in vitamin D and its adverse biological effects (hypercalcemia, renal failure, kidney stones, bone density).Methods: We used data from Google Trends to assess changes in RSV trends across the world's regions. Data were extracted via the search terms "cholecalciferol", "ergocalciferol, "hypercalcemia", "acute renal failure", "kidney stones", and "bone density" from queries in English from 1 January 2004 to 1 October 2018 in the tool's related query database. Statistical analysis was performed using SPSS (R) 22.0 for Windows (IBM Inc., Armonk, NY, USA, 10504-1722).Results: There was a correlation between the RSV of cholecalciferol and ergocalciferol (Spearman's correlation) and the RSV of hypercalcemia, renal failure, kidney stones, and bone density. As measured by the change in RSV score, the trend for interest in kidney stones increased more rapidly than that for the other search terms. There was a positive correlation between the RSV score for cholecalciferol (or ergocalciferol) and renal failure and between the RSV score for cholecalciferol (or ergocalciferol) and kidney stones, whereas there was a negative correlation between cholecalciferol and hypercalcemia. The interest of ergocalciferol increased in parallel with the interest in bone density. The highest concentration of interest in cholecalciferol occurred in North America, Europe, India and Australia, whereas interest in ergocalciferol was greater in Central and South America, Spain, and Thailand. Interest in kidney stones was greater than cholecalciferol in North America, Brazil, India, and Australia, while interest in bone density was greater than cholecalciferol in North America, Brazil, Italy, Spain, South Africa, and Australia.Conclusions: In the pre-pandemic COVID-19 (COronaVIrus Disease 19) era, our preliminary results showed a positive correla-tion between global interest in cholecalciferol and kidney stones and renal failure, respectively. However, we found an unexpected negative correlation between global interest in cholecalciferol and hypercalcemia. Additionally, we found a positive correlation between global interest in ergocalciferol and bone density. These correlations can inform health interventions and education.

Pandemic-induced fear and stock market returns: Evidence from China

We construct a pandemic-induced fear (PIF) index to measure fear of the COVID-19 pandemic using Internet search volumes of the Chinese local search engine and empirically investigate the impact of fear of the pandemic on Chinese stock market returns. A reduced-bias estimation approach for multivariate regression is employed to address the issue of small-sample bias. We find that the PIF index has a negative and significant impact on cumulative stock market returns. The impact of PIF is persistent, which can be explained by mispricing from investors' excessive pessimism. We further reveal that the PIF index directly predicts stock market returns through noise trading. Investors' Internet search behaviors enhance the fear of the pandemic, and pandemic-induced fear determines future stock market returns, rather than the number of cases and deaths caused by the COVID-19 pandemic.

Googling "Anatomy dissection": Pre-pandemic, pandemic, and current scenario.

OBJECTIVES: The present study was proposed to assess if the online search behavior for Anatomy dissection was affected by actual dissection being performed in the labs. The interest in dissection was ascertained and compared between pre-pandemic, pandemic, and current times. METHODS: Online web search behavior for key terms related to "Anatomy dissection" was noticed worldwide using Google Trends Tool. Relative search volume (RSV) was downloaded for these keywords worldwide using all categories, and web search settings during a period from January 1, 2018, to July 31, 2022. RESULTS: There was almost a similar google trend for the first three months in years 2018 and 2020, with a slightly lower RSV in March and a noticeable RSV decrease from April onwards in 2020. During the pre-pandemic period, the peak for RSV in the month of May was noticed. These peaks were missing in 2020 and 2021. In May 2022, RSV again increased. The top five countries with the highest search hit for "Anatomy Dissection" web were the Philippines, the United States, Canada, Australia, and India. CONCLUSIONS: There was lower search trend for "Anatomy dissection" during the pandemic period as compared to pre-pandemic period. The search trends may be associated with the closure of dissection labs and it may be concluded that Anatomy learners search for this term more often, if they are actually performing the dissections. The future integrated multi-country data and analysis from different set-ups about their ways of dissection and labs before and after the pandemic may further clarify.

Analysis and comparison of web searches in Google Trends in the business and industrial category for the word's "resilience" and "wellbeing" during COVID-19.

OBJECTIVE: The comparison of Google internet searches for worker wellbeing and resilience during COVID has not previously been undertaken. It is important to understand interest in wellbeing and resilience as both constructs influence health and burnout. Our objective to investigate internet interest in both wellbeing and resilience during COVID. Using Google Trends, data on global search English word queries we compared "worker wellbeing" or "wellbeing" versus "resilience" or "psychological resilience". Two time periods were compared, the last 5 years and the last 12 months, both up until the end of April 2022. The relationship between web search interest, reflected by search volume index (SVI) for all categories versus the business and industrial category evaluated. RESULTS: Open category searches on Google trends for the key words "worker wellbeing" or "wellbeing" demonstrated increased SVI peaks for COVID periods. Sub-group analyses demonstrated the category business and industrial had less web search interest in wellbeing and an increase in search terms related to resilience but not psychological resilience. Online interest in wellbeing and resilience represents a complex search metric. There are differing search interests depending on whether the category business and industrial is chosen versus the general Google Trends category.

Covid-19 Sürecinde Türkiye’de Aşı Tereddüdü ile Google Arama Hacmi Verileri Arasındaki Ílişkinin Değerlendirilmesi

En başarılı halk sağlığı önlemlerinden biri olarak kabul edilmesine rağmen, aşılama, giderek artan sayıda bireyler tarafından güvensiz ve gereksiz olarak algılanmaktadır. Çalışmanın amacı, illere göre aşılanma yüzdeleri ile arama terimlerinin iller düzeyinde gerçekleştirilen arama hacimleri arasındaki ilişkiyi ortaya koymaktır. Çalışmanın bir diğer amacı da Google arama hacimleri ile haftalık vaka ve ölüm sayıları arasındaki ilişkiyi incelemektir. Haftalık Google arama hacimleri ile haftalık vaka ve ölüm sayıları arasındaki ilişkiyi ölçmeye yönelik korelasyon analizi yapılmıştır. Ardından da arama terimleri ile vaka ve ölüm sayılarının haftalık durumları grafik üzerinde karşılaştırılmıştır. Korelasyon analizi sonuçları incelendiğinde;vaka sayısı ile istatistiksel açıdan anlamlı ilişkinin “covid-19” arama terimi arasında olduğu ve bu ilişkinin yüksek derecede ve pozitif yönlü olduğu görülmektedir (p<,01). Haftalık ölüm sayıları ile istatistiksel açıdan anlamlı bir arama terimi olmadığı ve “covid-19” terimi hariç diğer terimlerin negatif yönlü ve zayıf bir ilişkiye sahip olduğu görülmektedir. Haftalık vaka sayıları ile ölüm sayıları arasındaki ilişki incelendiğinde, bu ilişkinin orta düzeyde, pozitif yönlü ve anlamlı olduğu saptanmıştır. Çalışmada, vaka sayıları arttıkça ölüm sayılarının da arttığı görülmektedir. Araştırma kapsamındaki arama terimlerinin illere göre ortalama aranma hacimleri incelendiğinde, en fazla “Covid-19” ve “aşı” terimlerinin aratıldığı saptanmıştır. Bu sonuçlar, çevrimiçi verilerin salgınların izlenmesinde ve tahmin edilmesinde büyük bir önem kazandığını göstermektedir.Alternate :Despite being accepted as one of the most successful public health measures, vaccination is perceived by an increasing number of individuals as unsafe and unnecessary. The aim of the study is to reveal the relationship between the vaccination percentages by provinces and the search volumes of search terms at the provincial level. Another aim of the study is to examine the relationship between Google search volumes and weekly cases and deaths. Correlation analysis was conducted to measure the relationship between weekly Google search volumes and weekly case and death numbers. Then, the weekly status of the search terms and the number of cases and deaths were compared on the chart. When the results of the correlation analysis are examined;it is seen that there is a statistically significant relationship between the number of cases and the search term "covid-19" and this relationship is high and positive (p<.01). It is seen that there is no statistically significant search term with the weekly death numbers, and other terms, except for the term "covid-19", have a negative and weak relationship. When the relationship between the number of weekly cases and the number of deaths was examined, it was found that this relationship was moderate, positive and significant. In the study, it is seen that the number of deaths increases as the number of cases increases. When the average search volumes of the search terms within the scope of the research are examined according to the provinces, it has been determined that the terms "Covid-19" and "vaccine" are mostly searched. These results show that online data has gained great importance in monitoring and predicting epidemics.

Googling Alzheimer Disease: An Infodemiological and Ecological Study.

INTRODUCTION: Understanding the emergent role of the internet on the health-seeking behavior of people is critical not only in the areas of medicine and public health but also in the field of infodemiology. METHODS: Using Google Trends, data on global search queries for Alzheimer disease (AD) between January 2004 and April 2021 were analyzed. The relationship between online interest, as reflected by search volume index (SVI), and measures of disease burden, namely prevalence, deaths, and disability-adjusted life years, was evaluated. RESULTS: There was a reduction in the tendency to search for AD during the past two decades. SVI peaks corresponded to news of famous people with AD and awareness months. Symptoms, causes, and differences with the term dementia were central queries for persons interested in AD. No notable overall correlation between SVI and measures of disease burden was found due to competing results. Sub-group analyses, however, showed that these correlations may be influenced by socioeconomic development, with strong negative significant associations observed in lower middle-income countries. CONCLUSION: Online interest in AD may represent a more complex metric influenced by socioeconomic factors. Awareness of the impact of celebrity diagnosis and awareness months on online search behavior may prove useful in the planning of public health campaigns for AD.

Google trends in "anatomy": pre-pandemic versus during COVID-19 pandemic.

PURPOSE: The purpose of the present study was to assess the online search behavior for the keyword "anatomy" worldwide and to compare the pre-pandemic and during COVID-19 pandemic scenario for the same. METHODS: Google trends tool was used for the assessment of the search behavior for the term "anatomy". The data, i.e. relative search volume (RSV) were downloaded for this term using the all categories, web search and only YouTube settings during a period from 1.1.2019 to 3.31.2021 from www.trends.google.com . The geographic trends for this search query were plotted across the world. RESULTS: Seasonal peaks were observed for the search term "anatomy" during the first 3 months of the year and in months of September, October and November in 2019. Similar seasonal peaks were observed for the year 2020 except that there was sudden decrease in RSV for term "anatomy" in the month of March. Though trend for the rest of the year was same, but there was general lower RSV in 2020. The country with highest search hit was United States followed by Canada, Ireland, Australia and Philippines. CONCLUSION: The search trend for pre-pandemic and pandemic period was similar with overall lower RSV during 2020, where it noticeably decreased during the initial phase of lockdown, i.e. in the month of March. As the whole world is still in the COVID-19 pandemic era, the future studies may report the google trends once the pandemic is over and may compare the post-pandemic trend for the same.

Dividend sentiment, catering incentives, and return predictability

Using Internet search volume of dividend-related keywords to measure investor preference for dividends that varies over time and across states, we show that dividend sentiment affects corporate policies and asset prices. Investors search more for dividends when economic conditions are poor, with the peak volume reached during the recent COVID-19 pandemic. Firms initiate or increase dividends when dividend sentiment is stronger, especially in regions with strong dividend sentiment. Shifts in dividend sentiment predict higher investor demand for dividends and higher returns for high dividend stocks. Further, mutual funds that pay high dividends receive more inflows when dividend sentiment is stronger.

Public interest and awareness regarding general health, sleep quality and mental wellbeing during the early COVID-19 pandemic period: An exploration using Google trends.

The internet network continues to be a major source of health-related information. Our research provides insights into the online health-seeking behaviors of the general population, and evaluates the potential relationship between the COVID-19 pandemic and public interest and awareness of general sleep health, mental health and wellbeing. Google Trends' weekly relative search volumes (RSVs) were examined during 2020 for searches specifically related to COVID-19 symptoms, and for searches related to general health, sleep and wellbeing, in the United Kingdom, the United States of America, France, Italy and Japan. To obtain insight into the association between the initiation of public restrictions and online search trends, we assessed a six-week period; the 'early pandemic period' (EPP) (01 March 2020 - 11 April 2020). To provide a meaningful pre-pandemic comparison, a similar period during 2019 (03 March - 13 April 2019) was compared for RSV and median difference analysis. The EPP was associated with increased online searches related to COVID-19 symptoms, as compared with those related to more general sleep health, mental health and wellbeing. The latter search terms frequently showed a decrease or minimal change in RSV during the EPP compared with the equivalent period in 2019. This finding illustrates the potential link between the COVID-19 pandemic and online search behavior and corroborates existing findings regarding internet searches during this period. Proactive communication by healthcare professionals during future pandemics and as an ongoing measure could help prevent public neglect of general health and wellbeing symptoms, and encourage reporting and early intervention.

Changes in Air Pollution-Related Behaviour Measured by Google Trends Search Volume Index in Response to Reported Air Quality in Poland.

Decreased air quality is connected to an increase in daily mortality rates. Thus, people's behavioural response to sometimes elevated air pollution levels is vital. We aimed to analyse spatial and seasonal changes in air pollution-related information-seeking behaviour in response to nationwide reported air quality in Poland. Google Trends Search Volume Index data was used to investigate Poles' interest in air pollution-related keywords. PM10 and PM2.5 concentrations measured across Poland between 2016 and 2019 as well as locations of monitoring stations were collected from the Chief Inspectorate of Environmental Protection databases. Pearson Product-Moment Correlation Coefficients were used to measure the strength of spatial and seasonal relationships between reported air pollution levels and the popularity of search queries. The highest PM10 and PM2.5 concentrations were observed in southern voivodeships and during the winter season. Similar trends were observed for Poles' interest in air pollution-related keywords. Greater interest in air quality data in Poland strongly correlates with both higher regional and higher seasonal air pollution levels. It appears that Poles are socially aware of this issue and that their intensification of the information-seeking behaviour seems to indicate a relevant ad hoc response to variable threat severity levels.

Increased global online interest in diabetes during the COVID-19 pandemic: An infodemiology study.

Background: The public utilize the internet as their main source for health-related information during the pandemic. This was shown by the increase in global online searches related to health during the pandemic. In this study, the dynamics of public interest and awareness in diabetes before and during the pandemic was investigated and the possible factors associated with online interest in diabetes were determined. Methods: Global online search interest for diabetes was measured using Google Trends™ database. The search terms "diabetes", "type 1 diabetes", "type 2 diabetes", and "gestational diabetes" were used. The results were limited to the years 2010 until 2020 from all countries. Correlation between country-specific characteristics and search volume index (SVI) was determined using Spearman's rank-order correlation. Results: This study showed a steady increase in global online interest in diabetes during the last decade. SVI for all the diabetes search terms included in this study increased from 2019 to 2020. People searching for the term "diabetes" also searched for the different types of diabetes, causes, signs and symptoms, diagnostic tests, and treatments for diabetes. The increasing online interest in diabetes was positively correlated with percentage of individuals using the internet and the number of physicians in a country. Conclusions: The results of this study showed an increasing global online interest in diabetes during the last decade. This increased global interest in diabetes should be maximized by medical doctors and public health officials in providing evidence-based information regarding prevention and control of diabetes in the internet.

Detecting epidemiological relevance of adenoid hypertrophy, rhinosinusitis, and allergic rhinitis through an Internet search.

PURPOSE: This study aimed to detect the epidemiological relevance between adenoid hypertrophy (AH) and rhinosinusitis, and AH and allergic rhinitis (AR) through an Internet search. METHODS: Internet search query data from January 2011 to December 2019 in China were retrieved from the Baidu Index (BI). Spearman's correlation coefficients were used to detect the correlation among the search volumes of AH, rhinosinusitis, and AR. We also collected search data from the first 5 months of 2020, when quarantine was implemented in China due to the coronavirus disease 2019 epidemic. Then, we compared the search data to those obtained during the same period in 2019 to assess the effects of isolation on AH and AR. RESULTS: Statistically significant relevance was found between the search variations of AH and rhinosinusitis during 2011-2019 (R = 0.643, P < 0.05). However, the relationship between AH and AR was weak (R = - 0.239, P < 0.05) and that between rhinosinusitis and AR (R = - 0.022, P > 0.05) was not relevant. The average monthly search volume of AH and rhinosinusitis had a strong correlation (R = 0.846, P < 0.01), but AH and AR and rhinosinusitis and AR were not correlated (R = - 0.350, P > 0.05; R = - 0.042, P > 0.05, respectively). AH and rhinosinusitis search volumes decreased consistently during the first 5 months of 2020 (isolation), whereas that for AR increased during January-February. CONCLUSION: AH had an epidemiological relationship with rhinosinusitis, which was not consistent with AR. The decrease in public gathering effectively reduced the morbidities of AH and rhinosinusitis but not those of AR.

Temporal Trends and Interest in Coronary Artery Calcium Scoring Over Time: An Infodemiology Study.

OBJECTIVE: To evaluate interest in coronary artery calcium (CAC) among the general public during the past 17 years and to compare trends with real-world data on number of CAC procedures performed. METHODS: We used Google Trends, a publicly available database, to access search query data in a systematic and quantitative fashion to search for CAC-related key terms. Search terms included calcium test, heart score, calcium score, coronary calcium, and calcium test score. We accessed Google Trends in January 2021 and analyzed data from 2004 to 2020. RESULTS: From 2004 to December 31, 2020, CAC-related search interest (in relative search volume) increased continually worldwide (+201.9%) and in the United States (+354.8%). Three main events strongly influenced search interest in CAC: reports of a CAC scan of the president of the United States led to a transient 10-fold increase in early January 2018. American College of Cardiology/American Heart Association guideline release led to a sustained increase, and lockdown after the global pandemic due to COVID-19 led to a transient decrease. Real-world data on performed CAC scans showed an increase between 2006 and 2017 (+200.0%); during the same time period, relative search volume for CAC-related search terms increased in a similar pattern (+70.6%-1511.1%). For the search term coronary calcium scan near me, a potential representative of active online search for CAC scanning, we found a +28.8% increase in 2020 compared with 2017. CONCLUSION: Google Trends, a valuable tool for assessing public interest in health-related topics, suggests increased overall interest in CAC during the last 17 years that mirrors real-world usage data. Increased interest is seemingly linked to reports of CAC testing in world leaders and endorsement in major guidelines.

The impact of the pandemic declaration on public awareness and behavior: Focusing on COVID-19 google searches.

The unprecedented outbreaks of epidemics such as the coronavirus has caused major socio-economic changes. To analyze public risk awareness and behavior in response to the outbreak of epidemic diseases, this study focuses on RSV (Relative Search Volume) provided by Google Trends. This study uses the social big data provided by Google RSV to investigate how the WHO's pandemic declaration affected public awareness and behavior. 37 OECD countries were analyzed and clustered according to the degree of reaction to the declaration, and the United States, France and Germany were selected for comparative study. The results of this study statistically confirmed that the pandemic declaration increased public awareness and had the effect of increasing searches for information on COVID-19 by more than 20%. In addition, this rapid rise in RSV also reflected interest in the COVID-19 test and had the effect of inducing individuals to be tested, which helped identify new cases. The significance of this study is that it provided the theoretical foundation for using RSV and its implications to understand and strategically utilize public awareness and behavior in situations where the WHO and governments must launch policies in response to the outbreak of new infectious diseases such as COVID-19.

Cardiovascular-related health behaviors and lifestyle during the COVID-19 pandemic: An infodemiology study.

BACKGROUND: Reports have suggested decreasing attention to CVD comorbidities during the COVID-19 pandemic, despite their association with worse virus-related outcomes. Using nowcasting tools, we sought to explore temporal trends in public interest by studying use of online search terms related to CVD comorbidities during the pandemic time period. METHODS: We queried Google Trends for recent (October 2019-October 2020) and seasonal (October 2016-October 2020) trends of search terms pertaining to cardiovascular-related behaviors or clinical care including clinical diagnostic and therapeutic-related terms. Additionally, we acquired data from Google Shopping Insights to explore consumer behavior. Data for search results in the US were compared using mean relative search volumes (RSV), tabulated by month. RESULTS: Online search interest in the terms "Exercise" and "Cigarettes" changed by +18.0% and -52.5%, respectively, comparing March-April with January-February 2020. Key terms related to CVD-related care, including diagnostic and therapeutic-related terms such as "Statin", "Lipid profile", "Low-density lipoprotein", and "Hemoglobin A1C" declined to a four-year low in late March 2020 but regained pre-pandemic search query frequency by July 2020. Results were supported by Google Shopping analysis; for example, online consumer shopping-related searches for tobacco products reached at an all-year low after May 2020. CONCLUSION: We report an increase in search interest for an overall healthier CVD-related lifestyle starting in March 2020, supported by online consumer shopping behavior. However, a months-long trough in public interest for CVD care-related search terms from March-May 2020 suggests a transient but substantial decrease in public focus on cardiovascular-related healthcare engagement. Future research is needed to understand if these mixed signals will persist into 2021 and how they potentially translate into real-world CVD-related event rates.

Information flow and COVID-19 recovery.

This study examines whether the flow of information pertaining to COVID-19 helps to contain the pandemic. We capture the information flow of the pandemic using the Google Search Volume Index for the keyword coronavirus+covid in 33 states and union territories in India. We find that the information flow is inversely related to positive cases reported in these regions. This result suggests that internet inclusion is a relevant factor in the fight against the pandemic.

Rapid Decline in Online Search Queries for Hip and Knee Arthroplasties Concurrent With the COVID-19 Pandemic.

BACKGROUND: In response to the coronavirus disease 2019 (COVID-19) pandemic, US hospitals have canceled elective surgeries. This decline in total joint arthroplasty (TJA) revenue may place financial strain on hospitals. Our goal was to quantify the impact of COVID-19 on the public interest in elective TJA. METHODS: The Google Search Volume Index (GSVI) identified the terms "knee replacement," "hip replacement," and "orthopedic surgeon" as the most common to describe TJA. The term "elective surgery cancellation" was also analyzed. Weekly GSVI data were extracted between 04-01-2015 and 04-04-2020. Time series analysis was conducted and state GSVI values were compared with COVID-19 prevalence and unemployment claims. RESULTS: The relative public interest in elective TJA has sharply declined since the WHO declaration of COVID-19 as a global pandemic. Between 03-01-2020 and 03-29-2020, the popularity of searches for "knee replacement", "hip replacement," and "orthopedic surgeon" dropped by 62.1%, 52.1%, and 44.3%, respectively. A concurrent spike was observed for the term "elective surgery cancellation." California, New Hampshire, Maine, and Nevada showed a low relative rate for TJA searches, and the highest increase in unemployment claims. CONCLUSION: The onset of COVID-19 correlates with declining relative popularity of searches related to elective TJA. Higher volume of COVID-19 cases in certain states may correspond with lower relative search popularity, although this correlation remains unclear. These results portend the possibility of a decline in elective TJA case volume, further straining hospitals. Further research is required to inform stakeholders how best to proceed and determine any sustained effects from the current diminished relative interest in TJA. LEVEL OF EVIDENCE: Level III.