Publications by authors named "Yunna Kwan"

6 Publications

  • Page 1 of 1

Association between urine cotinine and depressive symptoms in non-smokers: National representative sample in Korea.

J Affect Disord 2021 Nov 16;294:527-532. Epub 2021 Jul 16.

Department of psychiatry, Yonsei University Wonju College of Medicine, Wonju, Republic of Korea. Electronic address:

Background: Secondhand smoke (SHS) exposure is known to have negative effects on mental as well as physical health. However, the association between SHS and mental health problems has not been assessed in non-smokers. To evaluate the association of exposure to tobacco smoke and depressive symptoms, and that of the prevalence of having depressive symptoms and urinary cotinine (UCo) concentrations in non-exposed subjects.

Methods: Data was extracted from the Korea National Health and Nutrition Examination Survey (KNHANES). Depressive symptoms were determined based on a patient's overall score on the Patient Health Questionnaire (PHQ)-9, and SHS exposure was evaluated using self-reported data and UCo concentration. Overall, 13,219 non-smokers, ≥ 19 years were included in the study. Multinomial logistic regression analysis was conducted to identify factors related to depressive symptoms; independent t-test was conducted to confirm the differences in UCo concentration according to the prevalence of depression.

Results: Among the non-exposure groups, 2.0% of the males and 5.6% of the females showed depressive symptoms. Lower social-economic status, higher UCo concentration, and SHS exposure increased the prevalence of depressive symptoms. The UCo concentration of females with depressive symptoms was significantly higher than those of females without depressive symptoms.

Limitations: This study only demonstrated an association between SHS exposure and depression, not the causal effects, because of the cross-sectional study design.

Conclusion: SHS exposure and depressive symptoms are correlated. The association was also confirmed by evaluating the UCo concentration of those who were not exposed to SHS based on self-reported data.
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http://dx.doi.org/10.1016/j.jad.2021.07.039DOI Listing
November 2021

Public Interest in Immunity and the Justification for Intervention in the Early Stages of the COVID-19 Pandemic: Analysis of Google Trends Data.

J Med Internet Res 2021 06 18;23(6):e26368. Epub 2021 Jun 18.

Department of Gerontology Health and Welfare, Pai Chai University, Daejeon, Republic of Korea.

Background: The use of social big data is an important emerging concern in public health. Internet search volumes are useful data that can sensitively detect trends of the public's attention during a pandemic outbreak situation.

Objective: Our study aimed to analyze the public's interest in COVID-19 proliferation, identify the correlation between the proliferation of COVID-19 and interest in immunity and products that have been reported to confer an enhancement of immunity, and suggest measures for interventions that should be implemented from a health and medical point of view.

Methods: To assess the level of public interest in infectious diseases during the initial days of the COVID-19 outbreak, we extracted Google search data from January 20, 2020, onward and compared them to data from March 15, 2020, which was approximately 2 months after the COVID-19 outbreak began. In order to determine whether the public became interested in the immune system, we selected coronavirus, immune, and vitamin as our final search terms.

Results: The increase in the cumulative number of confirmed COVID-19 cases that occurred after January 20, 2020, had a strong positive correlation with the search volumes for the terms coronavirus (R=0.786; P<.001), immune (R=0.745; P<.001), and vitamin (R=0.778; P<.001), and the correlations between variables were all mutually statistically significant. Moreover, these correlations were confirmed on a country basis when we restricted our analyses to the United States, the United Kingdom, Italy, and Korea. Our findings revealed that increases in search volumes for the terms coronavirus and immune preceded the actual occurrences of confirmed cases.

Conclusions: Our study shows that during the initial phase of the COVID-19 crisis, the public's desire and actions of strengthening their own immune systems were enhanced. Further, in the early stage of a pandemic, social media platforms have a high potential for informing the public about potentially helpful measures to prevent the spread of an infectious disease and provide relevant information about immunity, thereby increasing the public's knowledge.
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http://dx.doi.org/10.2196/26368DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8216330PMC
June 2021

Development of a Structured Interview to Explore Interpersonal Schema of Older Adults Living Alone Based on Autobiographical Memory.

Int J Environ Res Public Health 2021 02 26;18(5). Epub 2021 Feb 26.

Department of Psychiatry, Wonju Severance Christian Hospital, Wonju 26426, Korea.

With a growing public interest in the social health of older adults, studies focusing on social networks and interpersonal relationships of older adults are needed. The present study was conducted to develop a structured interview to evaluate the interpersonal schema based on Self-Defining Memory of older adults. First, the word cues that the older adults often report on interpersonal events were confirmed. Next, the indices and scoring rules were prepared, including Relationship frequency (RF), Conflict frequency (CF), Dominance mean (Dm), and Warmth mean (Wm). Healthy older adults living alone (mean age = 71.81, SD = 3.95) were interviewed. Finally, the correlation between each index and Short form of Korean Inventory of Interpersonal Problems Circumplex Scales (KIIP-SC) was analyzed for criterion validity. The inter-rater reliability was substantial (Kappa = 0.61~0.66). Based on the analysis of criterion validity, the indices of CF, Dm, and Wm indices showed an appropriate level of criterion validity. This study developed a structural interview based on a novel system of reporting autobiographical memory and established indices with appropriate validity to evaluate interpersonal relationships. The interview is expected to identify the characteristics of interpersonal relationships of the older adults and contribute to the establishment of the older adults' community accordingly.
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http://dx.doi.org/10.3390/ijerph18052316DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7956442PMC
February 2021

Development of a Structured Interview to Explore Interpersonal Schema of Older Adults Living Alone Based on Autobiographical Memory.

Int J Environ Res Public Health 2021 02 26;18(5). Epub 2021 Feb 26.

Department of Psychiatry, Wonju Severance Christian Hospital, Wonju 26426, Korea.

With a growing public interest in the social health of older adults, studies focusing on social networks and interpersonal relationships of older adults are needed. The present study was conducted to develop a structured interview to evaluate the interpersonal schema based on Self-Defining Memory of older adults. First, the word cues that the older adults often report on interpersonal events were confirmed. Next, the indices and scoring rules were prepared, including Relationship frequency (RF), Conflict frequency (CF), Dominance mean (Dm), and Warmth mean (Wm). Healthy older adults living alone (mean age = 71.81, SD = 3.95) were interviewed. Finally, the correlation between each index and Short form of Korean Inventory of Interpersonal Problems Circumplex Scales (KIIP-SC) was analyzed for criterion validity. The inter-rater reliability was substantial (Kappa = 0.61~0.66). Based on the analysis of criterion validity, the indices of CF, Dm, and Wm indices showed an appropriate level of criterion validity. This study developed a structural interview based on a novel system of reporting autobiographical memory and established indices with appropriate validity to evaluate interpersonal relationships. The interview is expected to identify the characteristics of interpersonal relationships of the older adults and contribute to the establishment of the older adults' community accordingly.
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http://dx.doi.org/10.3390/ijerph18052316DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7956442PMC
February 2021

Development of a Structured Interview to Explore Interpersonal Schema of Older Adults Living Alone Based on Autobiographical Memory.

Int J Environ Res Public Health 2021 02 26;18(5). Epub 2021 Feb 26.

Department of Psychiatry, Wonju Severance Christian Hospital, Wonju 26426, Korea.

With a growing public interest in the social health of older adults, studies focusing on social networks and interpersonal relationships of older adults are needed. The present study was conducted to develop a structured interview to evaluate the interpersonal schema based on Self-Defining Memory of older adults. First, the word cues that the older adults often report on interpersonal events were confirmed. Next, the indices and scoring rules were prepared, including Relationship frequency (RF), Conflict frequency (CF), Dominance mean (Dm), and Warmth mean (Wm). Healthy older adults living alone (mean age = 71.81, SD = 3.95) were interviewed. Finally, the correlation between each index and Short form of Korean Inventory of Interpersonal Problems Circumplex Scales (KIIP-SC) was analyzed for criterion validity. The inter-rater reliability was substantial (Kappa = 0.61~0.66). Based on the analysis of criterion validity, the indices of CF, Dm, and Wm indices showed an appropriate level of criterion validity. This study developed a structural interview based on a novel system of reporting autobiographical memory and established indices with appropriate validity to evaluate interpersonal relationships. The interview is expected to identify the characteristics of interpersonal relationships of the older adults and contribute to the establishment of the older adults' community accordingly.
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http://dx.doi.org/10.3390/ijerph18052316DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7956442PMC
February 2021

Resting-state quantitative EEG characteristics of insomniac patients with depression.

Int J Psychophysiol 2018 02 11;124:26-32. Epub 2018 Jan 11.

Department of Psychology, Duksung Women's University, Seoul, South Korea. Electronic address:

Insomnia is known to show hyperarousal in the central nervous system. However, depression that often coexists with insomnia exhibits hypo-activity in the frontal lobe, which is very different from insomnia. In the present study, we examined wake resting state EEG of insomniac patients with depression to investigate whether they could be conceptualized as spectrum of insomnia or significantly different from insomnia. We compared the absolute power values of EEG spectra of three groups: 15 insomniacs with comorbid depression (CD), age- and sex-matched 15 comorbid-free insomniacs (CFI), and 15 good sleep controls (GSC). As a result, CD and CFI showed no significant difference in the EEG power spectrum analysis. Compared with GSC, however, both CD and CFI groups showed increased high frequency EEG amplitude. From these results, we have confirmed that CD shows cortical hyperarousal similar to insomnia in the daytime resting state. In conclusion, it would be reasonable to understood insomniac patients experiencing depression as a continuum of insomnia patients.
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http://dx.doi.org/10.1016/j.ijpsycho.2018.01.005DOI Listing
February 2018
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