Analysis of the Correlation between Mass-Media Publication Activity and COVID-19 Epidemiological Situation in Early 2022

Abstract

The paper presents the results of a correlation analysis between the information trends in the electronic media of Kazakhstan and indicators of the epidemiological situation of COVID-19 according to the World Health Organization (WHO). The developed method is based on topic modeling and some other methods of processing natural language texts. The method allows for calculating the correlations between media topics, moods, the results of full-text search queries, and objective WHO data. The analysis of the results shows how the attitudes of society towards the problems of COVID-19 changed from 2021–2022. Firstly, the results reflect a steady trend of decreasing interest of electronic media in the topic of the pandemic, although to an unequal extent for different thematic groups. Secondly, there has been a tendency to shift the focus of attention to more pragmatic issues, such as remote learning problems, remote work, the impact of quarantine restrictions on the economy, etc.

1. Introduction

The healthcare systems of almost all countries face numerous problems caused by increased demand for medical services and high expectations of the population in the periods of pandemic, and these factors entail higher costs [1]. It also should be noted that social and medical efficiency as well as economic one are important for the healthcare system since, as it was mentioned in [2], the medical activities of a therapeutic and preventive nature may be economically unprofitable, but the medical and social effect requires their implementation. This statement is especially true in the context of a pandemic. On the other hand, the COVID-19 pandemic is an appropriate example of how rumors and incomplete knowledge affect society. People rely on mass media as a source of information and feel uncertainty when threats arise in the environment [3]. According to the authors in [4], the pandemic provoked a surge of rumors and misinformation, which hindered the rational behavior of the population and, to some extent, facilitated the acceleration of the spread of the virus. The media reports significantly affected people’s emotions and psychological resilience in the course of the COVID-19 pandemic, [5]. More than 51% of news headlines in English-language media were negative in this period, and only about 30% of them were positive [6]. The information presented in such way can arouse negative emotions in a large number of people and can pose a threat to the human psyche [7]. As a result of the accompanying stress, the immunity suffers and people become more susceptible to infectious diseases. The population receives a significant portion of information through electronic media since most of the world’s population are Internet users. For example, in Kazakhstan, almost the entire adult population (14.73 million) use the Internet [8].

Therefore, an assessment of objectivity and quality of the presentation of materials by electronic media during the pandemic period allows for an understanding of how the media react to the current situation and to the necessary measures in the healthcare system. This assessment may reflect the quality of the presentation of materials and the “emotional overheating” of information; it can be used for the correction of published materials in order to increase the emotional and psychological stability of readers in the period of serious social shocks. Such estimation can be carried out using one of the subsections of artificial intelligence (AI): the methods of natural language processing (NLP) [9].

Firstly, the media influence public opinion, and therefore, the issues that are covered in the media contribute more to the worries of society. Secondly, the media, like any business, try to provide a product (publications) in accordance with the public demand, and cover those issues that concern society to a greater extent. Thirdly, the objectivity of the media can be assessed by comparing publications with the actual indicators of the pandemic. Therefore, in this work, the authors evaluated the results of the work of the media by comparative analysis of publication activity and objective WHO data exemplified by the media of Kazakhstan.

The goal of the work was to assess the dynamics of the correlation between the array of media publications of a particular country and the actual data of the COVID-19 pandemic. This research contributes to the development of a method, which makes it possible to evaluate the dynamic correlation between the materials published by the media and the objective data of the pandemic, and thereby to form an idea of their objectivity.

This paper consists of the following sections:

• Section 2 is devoted to the review of the studies on media analysis in the COVID-19 pandemic period;
• Section 3 contains a brief description of the applied method;
• Section 4 reveals and discusses the results.

We conclude with a summary of the discussion and possible objectives for future research.

2. Related Works

2.1. AI for Healthcare System Analysis

AI in healthcare is considered for image analysis, clinical record processing, genome research, and drug production [10]. Despite various restrictions of AI application considered in [11,12], the economic effect of its application in Europe alone is estimated at 200 billion euros [13].

At the same time, AI methods can also be used as a means to analyze the impact of the health care system on society. The health care system is multifaceted and one of its important parts is the social component.

A barometer of the social impact of the health care system is mass and social media coverage. The media have great significance in spreading the information to the public in critical periods, and the COVID-19 pandemic is an appropriate example of such a period. At the same time, such periods can increase the amount of false and tendentious information that has a destabilizing effect on society, and which often enjoys a heightened interest from readers. For example, the authors of [14] selected and analyzed 942 tweets and found that a higher number of tweets had false information, although such tweets had fewer retweets and lower engagement than tweets containing scientific evidence or factual statements. An increase in mental health problems among the Chinese population during the pandemic has also been reported [15,16], caused by a lack of objective information.

At the same time, according to the authors in [17], most studies in all fields have used a small amount of insufficiently reliable data for analysis to make decisions about the use of media interventions to influence health policy making [18]. Differences between various publications suggest that by reading news reports and analyses in different newspapers, readers have access to materials of varying scientific quality describing health risks and the effectiveness of measures taken to limit disease transmission. Existing ideological views can influence how information is used in reporting [19]. For example, many media outlets tend to support governments, showing a preference for how those governments interpret science, what policies they implement, and how they use science to justify their decisions [20]. Trends toward low-quality sensationalism, especially when combined with low scientific quality, can in some cases lead to public health threats and policy failures being characterized as less urgent and significant than they are. Although it has been argued that automated news quality assessment cannot yet fully replace the work of experts [21], NLP technologies can help in the way of analyzing large bodies of publications on health topics in the media and other open sources of information.

2.2. NLP and Topic Modeling for Healthcare System Analysis

Thematic analysis or creation of thematic models is the method, which can be successfully used in the field of NLP. Thematic modeling uses the statistic features of collecting the documents; this method can be applied for automatic abstracting, information extraction, information retrieval, and classification [22]. This approach relies on the intuitive understanding that the documents generate the groups with various frequency of appearance of words or combinations of words.

The statistical model of natural language is the foundation for the modern thematic models. A discrete distribution on a set of topics is used for description of documents within the probabilistic thematic models; a discrete distribution on a set of terms characterize the topics. In other words, the topic model demonstrates the belongness of the documents to the specific topic, and the specific words, used for generating the corresponding topic. The issue of the synonymy and polysemy of terms can be solved by application of clusters of terms and phrases, appeared as a result of thematic modelling. [23]. In recent studies, vector representations of words (word embeddings) have been proposed for thematic modeling, which allow the contextual usage of terms [24]. The following tools are employed to develop a thematic model of the body of documents: Probabilistic Latent Semantic Analysis (PLSA), Latent Dirichlet Allocation (LDA) [25], and Additive Regularization of Topic Models (ARTM) [26].

Thematic modeling can be applied to analyze general trends in health news presentation exemplified by COVID-19. The dynamics of changes in the array of the most relevant topics related to the pandemic can be compared with the dynamics of changes in the objective indicators of the COVID-19 pandemic provided by the WHO. A high correlation may indicate that the media are objective in conveying information about the pandemic. However, a low correlation may indicate that the media do not take into account all of the pandemic indicators.

3. Methods

In order to solve this problem, three aspects of measuring the dynamics of media publication activity in numerical form were investigated: automatically generated topics, average tone, and dynamic indicators based on the search queries, which were selected in a manual way. The basic steps of the method are as follows (see Figure 1):

1.

Create a corpus of documents using an automatic data collection system;

2.

Make a hierarchical thematic model using the methods described in [27];

3.

Calculate correlations between groups of dynamic media indicators and objective epidemiological indicators.

Figure 1. Method of assessing the mass media.

Figure 1. Method of assessing the mass media.

Further details on these steps are considered below.

3.1. Corpus of Documents

By scraping the Russian-language media of Kazakhstan, the corpus of documents was compiled [28]. The corpus comprises 761,831 documents related to the top news websites in the country published in the period from the start of 2020 to 23 February 2022. The corpus was collected using Scrapy Python library and contains news publications from over 20 major Russian-language news websites of Kazakhstan.

3.2. Preprocessing

Two preprocessing steps were applied to the corpus: lemmatization and creating n-grams.

Lemmatization was performed using PyMystem3 Python library, a wrapper for Yandex MyStem 3.1 morphological analyzer. No stop-word list or additional rules were applied, since ARTM regularizers can be tuned in such a way that common or utility words will be automatically excluded from analysis (as can be seen in the results section of the work).

N-grams were limited to bi- and trigrams. A frequency dictionary of all possible bigrams and trigrams of the corpus was built, and then only the n-grams between 90th and 60th percentiles (sorted by frequency) were included in the final dictionary.

3.3. The Creation of a Hierarchical Thematic Model

Thematic modeling is one of the very important methods of analyzing large bodies of texts. Researchers usually use LDA to construct a topic model [29]. In this study, the authors used ARTM, an extension of LDA, which differs in the use of configurable regularizers; these regularizers allow fine-tuning of the desired model output, including reducing or increasing the model’s propensity to include a word and/or document in multiple tops, changing the model’s propensity to have more or less non-zero weights in the resulting matrix, and so on.

Additive regularization, which restores the original distribution of words on documents D by maximizing the logarithm of plausibility, is combined with a weighted sum of regularizers (2), which is based on a wide variety of criteria:

$${\displaystyle \sum }_{d \in D}{\displaystyle \sum }_{w \in D}{n}_{dw}ln {\displaystyle \sum }_{t \in T}{\phi }_{wt}{\theta }_{td}+R\left(\phi ,\theta \right)\to max$$

(1)

$$R\left(\phi ,\theta \right)={\displaystyle \sum }_{i=1}{\tau }_i{R}_i\left(\phi ,\theta \right)$$

(2)

where “$n_{dw}$ is the frequency of the appearance of word w in the document d, ${\phi }_{wt}$ is the word w distribution in topic t, ${\theta }_{td}$ is the distribution of the topic t over the documents d, and ${{\displaystyle \sum }}_{i=1}{\tau }_i{R}_i\left(\phi ,\theta \right)$ is a weighted linear combination of regularizers (R) with non-negative ${\tau }_i$ weights” [30]. There are decreasing regularizers, smoothing regularizers, and de-corrective regularizers.

Using BigARTM library [26], we created a topic model that consists of 200 clusters of documents, from which experts chose 12 clusters relating to medicine. A sub-corpus of 119,956 documents was formed from these 12 clusters, on which thematic modeling was again performed with the formation of 150 thematic groups, from which the 47 most relevant thematic groups were selected (threshold exceeding 0.05). A sub-corpus of 100,481 documents was used to form the final model. Each resulting cluster contained texts with an affiliation greater than 0.1. Figure 2 shows the topic model with the most relevant words for each cluster.

3.4. Correlation Analysis

Objective indicators of the pandemic listed in [31] include the following indicators: the total of new tests for COVID-19, done on a daily basis; the share of positive results of tests as an average 7-day value (an inverse value of tests per case); the 7-day smoothed value of new proved cases of COVID-19; 7-day smoothed indicator of new deaths cases associated with COVID-19; 7-day average number of conductedtests per confirmed case of COVID-19, which is an inverse indicator for the positive rate; real-time evaluation of the productive reproduction rate (R) of COVID-19 virus; and Stringency index (Government Response Stringency Index: this indicator integrates 9 response indicators such as closed school and workplace, prohibited travel, etc.; the value is rescaled from 0 to 100 (100 is strictest response)). Each indicator was grouped into a thematic cluster with the highest correlation coefficient.

3.5. Source Code

Source code for the information system NLPMonitor, which supported the collection, processing, storage, and analysis of the data is available in [32].

Source code for the computational tasks is available in [33].

3.6. Threats to Validity

This research is based on the hypothesis that characteristics of relation between epidemiological, social, and economical issues and how they are being reflected in mass media is constant across the analyzed timeframe. However, over more than two years under analysis, some external factors affecting the relation could be subject to change. Some of the possible external factors include legislation changes (related to mass media), cultural or mentality shift, significant changes in economical well-being, etc. If such external factors changed significantly, interpretation of some of the results might be incorrect. We are not aware of any significant changes in important external factors during the analyzed period.

4. Results and Discussion

Using the method described above, a correlation matrix was constructed between thematic clusters of the corpus of texts reflecting information about the pandemic and the objective indicators listed above (see Figure 3). The full correlation matrix is shown in Appendix B.

With a thematic model, we can reduce the subjectivity inherent in expert analysis by correlating the dynamics of media activity. By doing so, a more objective picture of the correlation between significant information trends and the epidemiological situation can be formed. This approach, however, has its limitations. The number of topic clusters (topics), as well as other parameters of the topic model, are set manually, usually based on objective quality metrics (Perplexity, Sparsity Score [26], and the shoulder principle [34]). Accordingly, due to the limited number of topics, some subjectively important topics are not automatically generated.

For this reason, it is proposed to additionally use a set of manually generated search queries, which allow for the testing of individual hypotheses about the connection between the publication activity of a certain topic and the epidemiological situation. The following inquiries were suggested in [34]:

• Falsification, misinformation, anti-vaccination;
• Unemployment, poverty;
• Crisis, recession;
• Famine, hunger, people without shelter, poverty;
• Distance learning;
• Freelancing, distance working, brain drain;
• Crime, muggery, stealing, murder;
• Recession, credit, borrowing, microloans;
• Public health, clinics, problems, scandals in health sector;
• Vaccination, COVID-19 vaccines.

The authors of this study analyzed the dynamics of publication activity applying the above list of queries, allowing a comparative analysis of correlations over a longer time span. The search for these queries (in Russian) was performed with ElasticSearch using the method of full text search, presented the list of matched entries with the relative weights. ElasticSearch is a distributed open-source search engine that allows efficient full-text searching through a standard HTTP API. It is able to provide relevance coefficients given a text and search query based on how many words or n-grams co-occur in both the text and the search query. The average daily values of these relative weights were then calculated for the analysis and used for the correlation analysis. The correlation matrix for the queries listed is shown in Figure 4.

Figure 5 examines the thematic cluster “Incidence, School, Child, Growth, Epidemiological”, which has the maximum correlation with the indicator of new cases smoothed COVID-19 and is associated with the specified pandemic indicator over time. It can be seen that in 2020, the topic of distance learning for schoolchildren was actively raised only at the beginning of the school year (in September), and there is no direct correlation with the number of new cases smoothed. However, there is a strong correlation with the number of new cases smoothed out between 2021–2022. It can be assumed that the general population expected the relaxation of quarantine measures and the transition to full-time education, but the worsening of the epidemiological situation caused an increase in interest in this topic.

Figure 6 shows an example of dynamically analyzing search queries. The dynamics of the reproduction rate and the publication activity for the query “Vaccination, Vaccines, COVID” are highly correlated. On the other hand, the sharp increase in reproduction rate at the beginning of 2022 (probably due to the spread of the Omicron coronavirus strain) did not provoke great media reaction, and publication activity continued to decline, in line with the general trend of decreasing interest in COVID-19 (see Figure 7).

Figure 7 shows the relationships between publication activity on the topic reflecting the availability and prices of medicines and the positive test rate indicator. We can see that especially in the summer of 2020, there was a strong correlation. However, already in spring of 2021, the growth of the positive rate does not cause such a response of publication activity on this topic; this fact may indicate both stabilization of the situation with the supply of drugs and reduction of tension in society regarding the supply of drugs during the pandemic.

As shown in Figure 8, the topic of health fakes remains relevant, and publication activity has not waned, unlike vaccinations, medications, and the general epidemiological situation. However, since the summer of 2021, the correlation has become negative, in other words, waves of fakes have appeared when the epidemiological situation has improved.

Figure 9 illustrates the relationship between quarantine restriction severity and the dynamics of publication activity on the query “crisis, credit, debt, microcredit”, which confirms the hypothesis that quarantine restrictions have a negative impact on living standards and financial stability.

In Appendix A (Figure A1, Figure A2, Figure A3, Figure A4, Figure A5, Figure A6, Figure A7, Figure A8, Figure A9, Figure A10, Figure A11, Figure A12, Figure A13 and Figure A14), you can see additional graphic examples of topics and queries most strongly correlated with epidemiological indicators.

In order to analyze the dynamic of media interest in the pandemic as a whole, the largest topic directly related to COVID-19 was selected; the dynamics of changes was analyzed for the period from early 2020 to February 23, 2022. The top 25 words of the topic with relative importance weights include: Case (1.00); Infection (0.70); Coronavirus (0.65); Coronavirus_Infection (0.58); Coronavirus (0.42); Register (0.29); Kazakhstan (0.28); Patient (0.26); Infection (0.24); Pneumonia (0.22); Qui (0.22); Day (0.22); Illness (0.21); Identify (0.19); Illness (0.17); Find (0.16); Condition (0.15); Lethal (0.14); PCP (0.13); Register_Case (0.12); Almaty (0.12); March (0.12); Confirm (0.12); Illness (0.12); Get well (0.12). The weight of the most significant word is equal to 1, and the other weights are normalized relative to the maximum. Therefore, the weight of 0.5 can be interpreted as “two times less important than the maximum weight”.

COVID-19 interest is steadily decreasing as shown in Figure 10. Comparing the periods of January 2021 and of January 2022, the interest in this topic fell by about half. The value on the ordinate axis represents the ratio of the sum of the weights of the documents on this topic to the sum of all weights for all topics appearing during this period.

Therefore, the value might be understood as the topic’s proportion of the information flow. We can observe that in the beginning of 2020, when interest peaked, the only item related to COVID-19 made up roughly 8% of all news in the media; by the beginning of 2022, this percentage fell to 1%. One percent is a significant number, yet it is also relatively comparable to other topics. For instance, artificial intelligence, which is estimated similarly, represents between 1 and 5% of the market. If we take into account all of the COVID-19-related topics, the pandemic’s overall media share peaked between 10 and 15 percent.

The analysis of the correlation matrix by topic (see Figure 3) shows that, in addition to the obvious topics directly related to the epidemiological situation, topics related to school education (distance learning and quarantine restrictions) as well as the provision of medicines and their prices have the highest correlation with epidemiological indicators. The analysis of the correlation matrix by search queries (see Figure 4) revealed that the topics most related to the epidemiological situation are, on average, crisis, credit, remote work, and brain drain. At the moment, there is a correlation between vaccination and health issues, but it has decreased significantly. The relationships between fakes, poverty, people at risk of poverty, hunger, theft, and crime are weak or nonexistent. The comparison of the results presented in this research and the results presented in [32] allows us to make the following conclusions:

• Overall, the correlation in early 2022 between publication activity and epidemiological indicators fell compared to the first half of 2021. The maximum correlation in 2021 was as high as 0.8, whereas in 2022, it did not exceed 0.6–0.65.
• Compared to the previous study, the correlation with the search queries related to the coverage of the economic crisis, remote work, microcredit, etc., has increased. Particularly evident is the increase in the correlation with the Stringency index, especially in view of the recent abrupt changes in (removing of) quarantine restrictions. At the same time, the correlation with issues related to health care, vaccination, etc., has decreased. This may suggest that the public has become more concerned about pragmatic issues related to quarantine restrictions than health issues themselves.
• In general, the correlation with relative indicators, such as reproduction rate and tests per case, has increased. These indicators more objectively reflect the epidemiological situation, compared to absolute indicators (for example, the number of new cases without the number of tests is essentially a useless indicator). This is a positive indicator that the media has become more reflective to the epidemiological situation in the country compared to the initial period of the pandemic.

5. Conclusions

The research presents a methodology for evaluating the relationships between the objective pandemic indicators presented by WHO, and media publishing activity. The proposed method permits to make such comparison promptly. The method is based on the thematic model of the media corpus. The change in the volume of COVID-19 topics over time is compared with the change in the pandemic indicators. A number of manually generated queries are additionally used to increase the objectivity of the analysis. The topics obtained through the use of queries are also compared with the specified pandemic indicators.

Overall, analysis of the corpus of texts showed a significant decrease in media interest in the topic of COVID-19 in 2022. Although publication activity on the topic of the pandemic correlated with the main epidemiological indicators, the maximum correlation decreased by 20 percent compared to the data from one year ago. At the same time, the correlation with relative indicators (positive rate, reproduction rate, tests per case) increased. The correlation of the pandemic topic with economic issues, employment, and standard of living increased. In our opinion, this fact reflects an increase in media objectivity compared to the initial stage of the pandemic. In future studies, the authors plan to assess the change in the tone of media publications on COVID-19 during different periods of the pandemic.