Relationship between cognition and emotions caused by the COVID-19 infection, and depression and anxiety

doi:10.21203/rs.3.rs-2110868/v1

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Research Article

Relationship between cognition and emotions caused by the COVID-19 infection, and depression and anxiety

https://doi.org/10.21203/rs.3.rs-2110868/v1

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Background

Although negative cognition and emotions are known to develop with experiences of COVID-19 infection, it remains unclear whether such cognitions and emotions contribute to depression and anxiety as post-acute symptoms of COVID-19. We aimed to investigate the relationships between cognition and emotions caused by COVID-19 infection and depression and anxiety.

Methods

A cross-sectional survey of COVID-19 recovered patients was conducted from July to September 2021 in Japan. Outcome variables, depression and anxiety were assessed using the Patient Health Questionnaire-9 and Generalized Anxiety Disorder-7); scores of 10 and above were identified as having symptoms of depression and anxiety, respectively. Exposure variables were whether participants were experiencing the following cognition and emotions strongly: threat to life due to COVID-19 infection, helplessness regarding COVID-19 infection, blaming a third party who did not restrain from going outside, blaming themselves for their COVID-19 infection, worry about spreading the infection to others, and self-stigma (Self-Stigma Scale-Short). Modified Poisson regression analyses were performed to analyze the findings.

Results

A total of 6016 responses were included in the analyses. The proportion of depression was 19.88%, and anxiety was 11.47%. The threat of life due to COVID-19 infection, helplessness regarding COVID-19 infection, blaming oneself for their COVID-19 infection, and self-stigma were significantly associated with depression and anxiety after adjusting covariates. Blaming the third party who did not restrain from going outside was associated with anxiety. There was no association between the worry about spreading to others and depression or anxiety.

Conclusion

Negative cognition and emotions, including self-stigma with the experience of COVID-19 infection, were related to depression and anxiety. Countermeasures for preventing or decreasing the cognition and emotions may be needed to mitigate these symptoms.

COVID-19

Post-Acute Sequelae of COVID-19

depression

anxiety

mental health

psychological difficulties

COVID-19 infection is problematic in post-acute sequelae of COVID-19 (PASC) after recovery; psychiatric symptoms, such as depression and anxiety, are commonly observed as PASC (1). According to a meta-analysis, 19.2% − 21.5% of COVID-19 recovered patients were diagnosed with depression, and 14% − 44% were diagnosed with general anxiety disorder (2). Moreover, four months post infection, 20.6% had depressive symptoms and 31.4% had anxiety symptoms(3) (Morin et al., 2021). These psychiatric symptoms are usually observed six to twelve months after the infection, and the proportion of individuals experiencing such symptoms is higher than those who were not infected with COVID-19. Depressive and anxiety symptoms appear to be long-term residuals (4–6). Individuals with other infectious diseases do not have such high rates of residual depressive and anxiety symptoms (5, 7, 8). Depressive and anxiety symptoms cause low quality of life and socio-economic loss (9–11). Therefore, exploring the factors relating to depressive and anxiety symptoms in COVID-19 recovered patients is necessary for preventing or moderating these symptoms.

Both psychological and biological or demographic factors such as age, comorbidity, hospitalization, and physical complaints are likely to affect depressive and anxiety symptoms of PASC (13–22). In fact, some psychological factors known for affecting depression and anxiety in the general population were also observed to be associated with such psychiatric symptoms in COVID-19 recovered patients. For example, a cross-sectional survey explains that psychological stress perceived after COVID-19 infection contributes to mental health problems in COVID-19 recovered patients (24, 25).

In addition to general psychological factors mentioned above, COVID-19-specific psychological factors possibly contribute to depressive and anxiety symptoms in recovered patients, although this relationship remains unclear. Specifically, qualitative studies have found that COVID-19 recovered patients often suffer from several cognition and emotions, newly developed due to COVID-19 infection experiences such as COVID-19-related-stigma (26, 27), guilt of spreading the infection (26–28), threat of ambiguity in prognosis (29), and feeling of distancing from others (29). However, quantitative research has been insufficient in explaining these variables, except for self-stigma (30–32). Therefore, we aimed to exploratorily investigate whether the cognition and emotions of the experience of COVID-19 infection were associated with depression and anxiety in COVID-19 recovered patients.

Design and procedure

This survey was conducted with the cross-sectional design from July to September 2021 in Japan. All methods were performed in accordance with the relevant guidelines and regulations.(33). Participants were recruited via an internet survey agency, Rakuten Insight, which is one of the major survey agencies in Japan with a panel of approximately 2.2 million in 2019 (Rakuten Insight, Tokyo, Japan). Participants who agreed to participate in the survey and met the inclusion criteria were asked to complete the questionnaire. Participants who responded “yes” to the screening question “Have you ever been infected with COVID-19?” were defined as meeting the inclusion criteria in this study. Among these participants, the following were excluded from the analyses: (a) participants who answered the dummy question incorrectly; (b) participants who disclosed not meeting the inclusion criteria; (c) participants whose duration after COVID-19 infection was outside the range of 0 to 20 months, based on the date of COVID-19 pandemic in Japan; (d) participants who selected “others” for the question on educational level and could not be reclassified based on open-ended responses. No missing values were found in the analyzed data, since the online survey system prevents proceeding if there are any missing responses.

Patient and public involvement

One person who experienced COVID-19 infection participated in this study as a researcher. The psychological conflicts he experienced due to the COVID-19 infection were listed comprehensively, based on discussion between all researchers, and used as independent variables in this study.

Measurement

Outcome variables

The Patient Health Questionnaire-9 (PHQ-9) was used to measure the presence of depression as it has high validity and reliability (34, 35). It comprises nine items, rated on a 4-point scale: (0) not at all, (1) several days, (2) more than half the days, and (3) nearly every day. The Generalized Anxiety Disorder-7 (GAD-7)(36, 37) was used to measure anxiety. GAD-7 has also confirmed validity and reliability (36, 37), and comprises seven items rated on the same 4-point scale as the PHQ-9. A higher total score indicates greater symptom severity in both scales, and participants whose score were 10 and above were defined as having symptoms. (34–37)

Exposure variables

Based on the researcher’s experiences who experienced COVID-19 infection as mentioned above, the following questions were generated as cognition and emotions specific to COVID-19 infection: “How strongly did you feel the threat of life due to COVID-19 infection?” “How strongly did you feel helplessness to COVID-19 infection?” “How strongly did you blame the third party, such as policy and those who did not restrain from going outside, for your COVID-19 infection?” “How strongly did you blame yourself for your COVID-19 infection?” “How strongly did you worry about spreading COVID-19 to others when you were infected?” These questions were evaluated on five levels: not at all, a little, fair, strong, and very strong. Participants who selected “strong” or “very strong” were classified as those who experienced these cognitions and emotions strongly, while those who chose the other three alternatives were classified as those who did not experience them strongly.

Self-Stigma Scale-Short (SSS-S) (38) was used to measure the severity of self-stigma related to COVID-19. This scale is short version of the Self-Stigma Scale (SSS) with sufficient validity and reliability (38)(39). The scale is designed to measure self-stigma related to various minorities and diseases by adding to each question what self-stigma is to be measured. Hence, the expression “COVID-19 infected persons” was added to each item in this study. SSS-S comprises nine items rated on a 4-point Likert scale from 1 (strongly disagree) to 4 (strongly agree). A higher total score indicates a more severe self-stigma.

Covariates

Demographic data included age groups (20–29, 30–39, 40–49, 50–59, 60–69, 70–79, 80–89, ≥ 90 years), sex (male, female, other), educational level (high school education or lower, higher than high school), income level (based on the definitions by the Ministry of Health, Labor and Welfare (40)); (low, < 3 million JPY; medium, < 10 million JPY; high, ≥ 10 million JPY; unknown or refused to answer), residence (alone, co-residing), presence of physical comorbidities, and the presence of psychiatric history.

Clinical information regarding COVID-19 infection: duration after infection (less than one month, less than three months, less than six months, six months and over), whether hospitalized, and the presence of physical sequelae symptoms after COVID-19 infection, were also collected. All variables except the age group and sex were processed to binary numbers. Sex was converted to male or others for avoiding multicollinearity.

Statistical analysis

The characteristics of the participants in this study were primarily confirmed by calculating the mean and standard deviation (SD) for continuous variables, and the number and proportion for categorical variables. Modified Poisson regression analysis was applied to explore the association between exposure and respective outcome variables after adjusting the covariates. Following covariates were included in the model, based on the view whether they influenced both exposure and outcome variables: duration after infection (21, 41), hospitalization (15, 21, 42), presence of physical sequelae symptoms after COVID-19 infection (22, 23, 43), income level (44–46), residence (14, 47), presence of physical comorbidities (18, 19, 43), and presence of psychiatric history (19, 21, 48). Demographic information such as age group, sex, and educational level was also included in the model.

P-values less than 0.05 were considered statistically significant. Analyses were performed using Stata version 17 (College Station, TX: Stata Corp LLC).

Participant characteristics

Figure 1 shows the process of participant selection. Out of 9505 eligible individuals, 7760 completed the questionnaire. After excluding 1743 participants for incorrect or contradictory answers to the dummy question, 6016 were finally analyzed.

The demographic data for 6016 participants with COVID-19 infection are shown in Table 1. There were more than 1,000 participants in the groups aged 20 to 59 years, but less than 1,000 in the groups aged 60 and older. The proportion of females was higher than males or others. In terms of other demographic factors, 77.48% were higher than high school educated, 60.27% were classified as belonging to medium level of income, and 80.63% were living with someone. Individuals with psychiatric history were 17.73%, and those with physical comorbidity were 46.30%.

Regarding COVID-19 condition, 24.43% were hospitalized for COVID-19 infection, and 38.98% have had some persistent symptoms. The number of individuals in each group of duration after infection was over 1000, while the proportion of the period after infection was six months or more was higher than in other groups.

The mean PHQ-9 score was 5.19 (± 5.91), and the proportion of participants with a score over 10 was 19.88%. The mean GAD-7 score was 3.34 (± 4.71), and 11.47% participants obtained a score over 10.

The proportion of individuals who strongly perceived threat of life due to COVID-19 infection was 19.68%, while 27.94% felt helpless due to COVID-19 infection; 15.04% blamed the third party while 13.02% blamed themselves for their COVID-19 infection. A total of 51.75% were worried about spreading it to others. The mean self-stigma score was 19.21 (± 7.40).

Table 1

Participant characteristics
	Total (n = 6016)
Age group
20–29	n = 1192	19.81%
30–39	n = 1505	25.02%
40–49	n = 1581	26.28%
50–59	n = 1189	19.76%
60–69	n = 436	7.25%
70–79	n = 101	1.68%
80–89	n = 7	0.12%
≥ 90	n = 5	0.08%
Sex
Female	n = 3441	57.20%
Male	n = 2555	42.47%
Others	n = 20	0.33%
Educational level
Higher than high school educated	n = 4661	77.48%
Income level
Low	n = 842	14.00%
Medium	n = 3626	60.27%
High	n = 988	16.42%
Unknown/r refused to answer	n = 560	9.31%
Living together
Yes	n = 4851	80.63%
Psychiatric history
Yes	n = 1067	17.73%
Physical comorbidity
Yes	n = 2788	46.30%
Hospitalized
Yes	N = 1740	24.43%
Persistent symptoms
Yes	n = 2345	38.98%
Duration after infection	mean = 4.5	± 4.37
Less than 1 month	n = 1138	18.92%
Less than 3 months	n = 1443	23.99%
Less than 6 months	n = 1369	22.76%
6 months or more	n = 2066	34.34%
Depression (PHQ-9)	mean = 5.19	± 5.91
≥ 10	n = 1196	19.88%
Anxiety (GAD-7)	mean = 3.34	± 4.71
≥ 10	n = 690	11.47%
Self-stigma (SSS-S)	mean = 19.21	± 7.40
Threat of life due to COVID-19 infection	n = 1184	19.68%
Helplessness due to COVID-19 infection	n = 1681	27.94%
Blaming the third party who did not restrain from going outside	n = 905	15.04%
Blaming themselves for their COVID-19 infection	n = 783	13.02%
Worry about spreading to others	n = 3113	51.75%
PHQ-9 = Patient Health Questionnaire-9; GAD-7 = The Generalized Anxiety Disorder-7; SSS-S = Self-Stigma Scale-Short

Cognition and emotions associated with COVID-19 infection related to depression and anxiety

For depression, the threat of life due to COVID-19 infection (adjusted IRR = 1.23, 95% CI = 1.11–1.38, p < 0.001), helplessness regarding COVID-19 infection (adjusted IRR = 1.21, 95% CI = 1.09–1.33, p < 0.001), blaming themselves for their COVID-19 infection (adjusted IRR = 1.24, 95% CI = 1.1–1.39, p < 0.001), self-stigma (adjusted IRR = 1.05, 95% CI = 1.04–1.05, p < 0.001) were significantly associated with depression, independent of covariates (Table 2). VIF was 1.04–2.28.

For anxiety, threat of life due to infection (adjusted IRR = 1.35, 95% CI = 1.15–1.58, p < 0.001), helplessness regarding COVID-19 infection (adjusted IRR = 1.23, 95% CI = 1.07–1.42, p = 0.003), blaming the third party who did not restrain from going outside (adjusted IRR = 1.21, 95% CI = 1.04–1.41, p = 0.01), blaming themselves for their COVID-19 infection (adjusted IRR = 1.21, 95% CI = 1.03–1.43, p = 0.02), self-stigma (adjusted IRR = 1.06, 95% CI = 1.05–1.07, p < 0.001) were associated with anxiety, independent of covariates (Table 2). VIF was 1.05–2.28.

Worry about spreading the infection to others was not significantly associated with either PHQ-9 or GAD-7 scores.

Table 2

Cognition and emotions caused by COVID-19 infection related to depression and anxiety
	Depression (PHQ-9)			Anxiety (GAD-7)
	Adjusted IRR	(95% CI)	p	Adjusted IRR	(95% CI)	p
Threat of life due to COVID-19 infection
Not strongly experienced	1.00			1.00
Strongly experienced	1.23	(1.11—1.38)	< 0.001	1.35	(1.15—1.58)	< 0.001
Helplessness due to COVID-19 infection
Not strongly experienced	1.00			1.00
Strongly experienced	1.21	(1.09—1.33)	< 0.001	1.23	(1.07—1.42)	0.003
Blaming the third party who did not restrain from going outside
Not strongly experienced	1.00			1.00
Strongly experienced	1.08	(0.96—1.21)	0.19	1.21	(1.04—1.41)	0.01
Blaming themselves for their COVID-19 infection
Not strongly experienced	1.00			1.00
Strongly experienced	1.24	(1.1—1.39)	< 0.001	1.21	(1.03—1.43)	0.02
Worry about spreading to others
Not strongly experienced	1.00			1.00
Strongly experienced	0.93	(0.84—1.03)	0.15	0.87	(0.75—1.01)	0.06
Self-stigma (SSS-S)	1.05	(1.04—1.05)	< 0.001	1.06	(1.05—1.07)	< 0.001
Hospitalized
No	1.00			1.00
Yes	1.05	(0.95—1.16)	0.37	1.05	(0.91—1.21)	0.49
Persistent symptoms
No	1.00			1.00
Yes	2.29	(2.05—2.57)	< 0.001	2.19	(1.87—2.56)	< 0.001
Duration after infection
Less than 1 month	1.00			1.00
Less than 3 months	1.05	(0.91—1.21)	0.49	1.27	(1.03—1.57)	0.03
Less than 6 months	1.22	(1.06—1.4)	0.004	1.51	(1.23—1.85)	< 0.001
6 months or more	1.11	(0.97—1.27)	0.14	1.37	(1.13—1.67)	0.001
Psychiatric history
No	1.00			1.00
Yes	1.98	(1.79—2.19)	< 0.001	2.46	(2.13—2.84)	< 0.001
Physical comorbidity
No	1.00			1.00
yes	1.23	(1.11—1.35)	< 0.001	1.13	(0.99—1.3)	0.07
Sex
Others	1.00			1.00
Male	0.98	(0.88—1.08)	0.71	0.93	(0.81—1.07)	0.33
Age group	0.82	(0.79—0.86)	< 0.001	0.83	(0.78—0.88)	< 0.001
Educational level
High school educated or lower	1.00			1.00
Higher than high school educated	0.94	(0.85—1.05)	0.29	1.02	(0.87—1.19)	0.85
Living together
No	1.00			1.00
Yes	0.85	(0.76—0.96)	0.008	0.89	(0.75—1.05)	0.18
Income level
Low	1.00			1.00
Medium	0.83	(0.74—0.94)	0.004	0.84	(0.7—1)	0.052
High	0.76	(0.63—0.9)	0.002	0.78	(0.61—1)	0.052
Unknown/ refused to answer	0.78	(0.64—0.95)	0.01	0.93	(0.71—1.2)	0.56
IRR = Incidence Rate Ratio; CI = Confidence Interval; PHQ-9 = Patient Health Questionnaire-9; GAD-7 = The Generalized Anxiety Disorder-7; SSS-S = Self-Stigma Scale-Short

This study investigated the association between cognition and emotions of COVID-19 infection and psychiatric symptoms such as depression and anxiety, which are common sequelae of COVID-19 among COVID-19 recovered individuals. Our findings revealed that strong cognition and emotions caused by COVID-19 infection, such as the threat of life and helplessness regarding COVID-19 infection, blaming self for their COVID-19 infection, and self-stigma were associated with depression and anxiety in COVID-19 recovered patients. Blaming the third party who did not restrain from going outside was associated with anxiety.

Strong threat of life due to infection was associated with depression and anxiety. Although this has already been identified by a qualitative study (29), our study is the first to quantitatively show the relationships. In general, depression and anxiety are likely to occur after life-threatening traumatic events (49, 50). Since hospitalization status was adjusted in this study, the subjective threat of life is interpreted as an independent factor, separate from the actual danger to life. COVID-19 recovered patients tend to perceive the infection as a threat to life even when most of them are not considered in immediate danger by professionals. They recognize the prognosis of COVID-19 infection as unclear (25), and are prone to be driven into a corner during isolation (14, 51, 52); any sudden changes in their conditions are difficult to notice because of isolation.

A strong tendency to self-blame for one’s COVID-19 infection was also associated with depression and anxiety, as confirmed by previous qualitative studies (26, 27). This may also be a reason for depression and anxiety post recovery. In general, self-blaming is a distinguishing factor predicting depression (53). It is presumed that when people blame themselves, pessimistic predictions about how they will be evaluated by their surroundings, such as being blamed by others, arise. Such catastrophic future predictions are known to affect anxiety in general populations (54). These relationships between self-blaming and depression and anxiety can also apply to COVID-19 recovered patients.

A strong feeling of helplessness associated with COVID-19 infection contributes to depression and anxiety. This helplessness has not been reported in previous studies, while approximately 27% were found to suffer this cognition that affected depression and anxiety among COVID-19 recovered patients. The studies of the general population during COVID-19 pandemic provided contrary results to those of our study: strong feelings of helplessness regarding COVID-19 infection was associated with low anxiety as per the theory of motivated helplessness (55, 56).The idea of reliving painful experiences induced by COVID-19 infection, might be challenging to accept and result in anticipatory anxiety of reinfection as inevitable. Helplessness is a common cognitive distortion based on lacking the locus of control and leading to depression and anxiety (57, 58). Since people were still being infected with COVID-19 despite various precautions, such as lockdown, masks, washing, and vaccination, they might perceive reinfection as unavoidable.

COVID-19-related self-stigma also contributed to depression and anxiety in COVID-19 recovered patients. Our results supported previous studies indicating relationships between COVID-19-related self-stigma and psychiatric symptoms such as depression, anxiety, insomnia, and overall mental health (30, 31, 59). Self-stigma is suggested to activate low self-esteem resulting in depression, as with patients with other several illnesses (60–62). Furthermore, COVID-19 recovered patients with high self-stigma are probably concerned about negative impressions from others because their self-stigma is activated by internalizing public stigma (63). These concerns were risk factors for anxiety in general.(64)

Blaming the third party, policies or those who did not exercise restraint, was associated with anxiety, but not depression. The general population during COVID-19 pandemic tended to blame the government (65), and such cognition of blaming contributes to anxiety about COVID-19 safety (66, 67). This may also be true for patients recovered from COVID-19. Critical thinking about policies and morals is shaped by recognizing that they violate a safe social environment (68). Various risks associated with COVID-19 pandemic induce anxiety in the general population (69). COVID-19 recovered patients often fear reinfection because a high incidence of reinfection (70–73). Contrarily, the tendency to blame others did not relate to depression in general (53).

The worry about spreading the infection to others did not predict depression or anxiety. More than 50% of the participants had this cognition and emotion as COVID-19 is highly infectious and dangerous(1). Therefore, it may be an extremely common and healthy reaction to have such a worry.

COVID-19 recovered patients with low-income levels had high depression and anxiety. This finding was consistent with previous studies (44, 45, 74). Depression and anxiety in the older age group were lower. The same trend was observed in several studies of COVID-19 recovered patients (12, 13, 16, 17). Physical comorbidity was associated with depression and anxiety, as a systematic review indicates that any comorbidity before COVID-19 infection was related to depression and anxiety (17); some studies also suggest that the baseline Charlson comorbidities index predicts depression and anxiety after infection (18, 19). In addition, the relationship between a psychiatric history and depression and anxiety was also reported by previous studies (19, 21, 75). As for the duration after infection, depression remained over time except at the 6-month time point, and anxiety was higher at over one month than at less than one month. The results are in line with previous studies indicating that depression and anxiety increase from 3–12 months (4, 15). Physical symptoms as sequelae were associated with depression and anxiety, as observed in previous studies (22, 23). Living alone contributed to depression. This is consistent with the survey that loneliness and social withdrawal affect depression in COVID-19 patients (14). Living alone may not be associated with anxiety because of offsetting of negative and positive impacts: living with others induces worry about spreading infection to others as well as mental stability through cohabitation (47). Hospitalization was not related to depression or anxiety in this study and reports on this association are inconsistent across studies (2, 15, 21). This discrepancy may be seen because standards and facilities for hospitalization vary from country to country and the time of infection.

This study has some limitations which must be considered. First, concerns the sampling bias. Participants were recruited via the online research company; hence, they were limited to those who were able to access online systems. Over 90% of participants were under the age of 60, despite the higher percentage of COVID-19 infected patients being those above 60 years of age in Japan (76). Also, COVID-19 recovered patients whose sequelae were too severe to complete the questionnaire, could not participate in this study. Therefore, our results may not apply to elderly and individuals with high severity. Second, all variables were self-reported. Thus, variables such as diagnosis, the presence of infection, and treatment conditions may have been limited in accuracy. However, the proportion of COVID-19 recovered patients who agreed to participate in this study is similar to the proportion of COVID-19 infected patients in Japan (76). In addition, since the cognition and emotions caused by COVID-19 were generated based on the experience of one COVID-19 recovered patient, these were not investigated comprehensively; nor were they validated well. Third, the causal relationship between the study variables remains unclear because of the cross-sectional design. Whether changes in negative cognition and emotions improve depression and anxiety is uncertain. Despite these limitations, this study has the advantage of studying a large sample and revealing the status of Japanese COVID-19 recovered patients, including those not linked to medical care.

This study revealed that negative cognition and emotions, such as threat to life and helpless due to COVID-19 infection, blaming a third party or oneself for one’s infection contribute to depression and anxiety, independent of biological factors or baseline comorbidity. Therefore, in addition to providing effective treatment, involvement and environmental adjustments that may help avoid negative cognition and emotions caused by COVID-19 infection, may alleviate the psychiatric symptoms that have been widely reported as one of the aftereffects of this disease.

PASC: Post-Acute Sequelae of COVID-19

PHQ-9: The Patient Health Questionnaire-9

GAD-7: The Generalized Anxiety Disorder-7

SSS-S: Self-Stigma Scale-Short

Ethics approval and consent to participate: This study was performed with the approval by the ethical board of the National Center of Neurology and Psychiatry in Japan (A2021-34). Informed consent was obtained electronically from all participants before they completed the questionnaire.

Consent for publication: Not applicable

Availability of data and materials: The data used in this study will be made available to the corresponding author upon reasonable request.

Competing interests: Payments were made to DN from AIG General Insurance Company, Ltd, Startia, Inc., en-power, Inc., and MD.net for outside the submitted work. M.H., E.O., K.U., and M.K. have no competing interests.

Funding: This study was supported by an Intramural Research Grant for Neuro-logical and Psychiatric Disorders of NCNP (1-6).

Authors' contributions: Concept and design: D.N., M.H., K.U., E.O. Acquisition, analysis, or interpretation of the data: M.H., and D.N. Drafting of the manuscript: M.H. Critical revision of the manuscript for important intellectual content: M.H., K.U., E.O., M.K., and D.N. Statistical analysis: M.H. Supervision: D.N. All authors have read and agreed to the published version of the manuscript.

Acknowledgement: Not applicable

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Competing interest reported. Competing interests: Payments were made to DN from AIG General Insurance Company, Ltd, Startia, Inc., en-power, Inc., and MD.net for outside the submitted work. M.H., E.O., K.U., and M.K. have no competing interests.

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Relationship between cognition and emotions caused by the COVID-19 infection, and depression and anxiety

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Cognition and emotions associated with COVID-19 infection related to depression and anxiety

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