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The spread of coronavirus disease 2019 has led to several subsidiary health problems for the general public. Therefore, verification of psychosomatic responses under various conditions is required. The current study examines the mental and physical responses of individuals in Japan in relation to differences in basic demographic information. A web survey was conducted among 1500 people. The results showed that differences in ethnicity, concurrence of physical or mental illness, the nature of those living in the same household (eg, high-risk individuals or preschoolers), household income, and employment status were associated with differences in physical and mental health, psychological distress, and/or suicidal ideation. Differences related to the degree of the spread of the infection in the area of residence, degree of engagement in essential work, and frequency of contact with others during normal times were not found. Future longitudinal studies and verification of the effects of multiple variables are required.

Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) outbreak is expected to have harmed the mental health of numerous people worldwide. Therefore, the present study was aimed to explore the effects of the SARS-CoV-2 outbreak on the overall health of the general Japanese population, with a particular focus on identifying the factors associated with a requirement for mental health treatment. Japanese residents aged 18 years and above were surveyed online, and among the 1,500 obtained responses included for analysis, 14% reported severe psychological distress, and 8.9% indicated high suicidal ideation. A multiple regression analysis of the collected data revealed that “insufficient exercise” could significantly predict physical health (β = -0.23, SE = 0.03), while the life event stressors that could significantly predict mental health were the personality trait “neuroticism” (β = -0.16, SE = 0.03), and the life stressors of “outbreak-related mental health problems” (β = -0.22, SE = 0.03) and “uncertainty regarding the future” (β = -0.12, SE = 0.03). The personality traits of “agreeableness” (β = -0.08, SE = 0.02) and “neuroticism” (β = 0.22, SE = 0.02), and the factors “social support” (β = -0.12, SE = 0.02), “outbreak-related mental health problems” (β = 0.21, SE = 0.02), “uncertainty regarding the future” (β = 0.14, SE = 0.02), and “declining duration and quality of sleep” (β = 0.10, SE = 0.02) could predict psychological distress. Suicidal ideation was predicted by “neuroticism” (β = 0.11, SE = 0.03), “social support” (β = -0.27, SE = 0.03), and “having a psychiatric disorder” (β = 0.18, SE = 0.03). The results of the present study suggest that due to the spread of SARS-CoV-2, much of the Japanese population could be in requirement of psychiatric care. In particular, the individuals who rated high for the risk factors and low for the protective factors might require proactive support.

This study investigated the physical and psychological impacts of elements related to coronavirus disease (COVID-19) and demographic data in Japan both directly and as mediated by stressors, immediately following the rescinding of the state of emergency declaration accompanying the severe acute respiratory syndrome coronavirus 2 outbreak. An online survey was administered to 1,500 Japanese registered with an online outsourcing service. Data were analyzed with structural equation modeling using Mplus. Relatively large total effects were observed for “insufficient exercise” on physical health (β = –0.24, SE = 0.03), “mental health issues related to COVID-19” on mental health (β= –0.25, SE = 0.03) and psychological distress (β= 0.24, SE = 0.03), neuroticism on mental health (β= –0.30, SE = 0.02) and psychological distress (β= 0.36, SE = 0.02), and social support on suicidal ideation (β= –0.32, SE = 0.03). Thus, mitigating the harm resulting from the ongoing impact of the COVID-19 infection outbreak by raising awareness of risk factors and promoting social support is feasible.