Tracking the Irish adult population during the first year of the COVID-19 pandemic: A methodological report of the COVID-19 psychological research consortium (C19PRC) study in Ireland.

The COVID-19 Psychological Research Consortium (C19PRC) study was established to determine the impact of the COVID-19 pandemic on the population of multiple countries. Here, we provide a methodological overview, cohort profile, data access, and summary of key findings from the Republic of Ireland arm of the C19PRC study. A longitudinal internet panel survey was designed to collect data from a nationally representative sample of Irish adults (N = 1041) who were tracked from March/April 2020 to March/April 2021. Quota sampling methods were used to produce a sample that was representative of the population with respect to sex, age, and regional distribution. Data were collected in five waves, and new participants were recruited at follow-up waves to cover sample attrition and produce nationally representative samples at various points during the first year of the pandemic. A comprehensive battery of measures was used throughout the project to assess an array of sociodemographic, political, social, psychological, physical health, COVID-19, and mental health variables. Analyses were conducted to compare sample characteristic to known population parameters from available census data. These analyses showed that the sample was representative of the general adult population of Ireland on the three quota variables and was reasonable representative of the population across a diverse range of sociodemographic variables. These data representative the first and only nationally representative, longitudinal survey of the mental health of the Irish population. These data are made freely available to interested users (https://osf.io/2huzd/files/) and the findings of this study provide a methodological basis for the future use of these data.

Trajectories of change in internalizing symptoms during the COVID-19 pandemic: A longitudinal population-based study.

BACKGROUND: Longitudinal data indicates that the mental health of the general population may not have been as badly affected by the COVID-19 pandemic as some had feared. Most studies examining change in mental health during the pandemic have assumed population homogeneity which may conceal evidence of worsening mental health for some. In this study, we applied a heterogeneous perspective to determine if there were distinct groups in the population characterised by different patterns of change in internalizing symptoms during the pandemic. METHODS: Self-report data were collected from a nationally representative sample of Irish adults (N = 1041) at four time-points between April and December 2020. RESULTS: In the entire sample, mean levels of internalizing symptoms significantly declined from March to December 2020. However, we identified four distinct groups with different patterns of change. The most common response was 'Resilience' (66.7%), followed by 'Improving' (17.9%), 'Worsening' (11.3%), and 'Sustained' (4.1%). Belonging to the 'Worsening' class was associated with younger age, city dwelling, current and past treatment for a mental health problem, higher levels of empathy, and higher levels of loneliness. LIMITATIONS: Sample attrition was relatively high and although this was managed using robust statistical methods, bias associated with non-responses cannot be entirely ruled out. CONCLUSION: The majority of adults experienced no change, or an improvement in internalizing symptoms during the pandemic, and a relatively small proportion of adults experienced a worsening of internalizing symptoms. Limited public mental health resources should be targeted toward helping these at-risk individuals.

Changes in PTSD, depression, and generalized anxiety before and during the COVID-19 pandemic in Ireland.

BACKGROUND: : In this study, we compared the prevalence of posttraumatic stress disorder (PTSD), depression, and generalized anxiety disorder (GAD) before and during the COVID-19 pandemic across nationally representative samples of Irish adults. METHODS: : Participants were sampled in February 2019 (N = 1,020), April 2020 (N = 1,041), May 2020 (N = 1,032), and December 2020 (N = 1,100) using the same self-report measures. RESULTS: : The prevalence of PTSD significantly increased from 12.5% in 2019 to 18.0% in April 2020, to 22.0% in May, and returning to 17.6% in December 2020. PTSD increases were most consistently observed in males, those aged 18-34 years, those without a university qualification, and those living in the Leinster region of Ireland, where the capital city of Dublin is located. There were no significant changes in the prevalence of depression or GAD. LIMITATIONS: : The 2020 samples were not completely independent of one another and while the analysis took this into account, this bias cannot be completely removed. CONCLUSIONS: : These findings show an increase in PTSD during the initial stages of the COVID-19 pandemic compared to the pre-pandemic period and suggest specificity in mental health responses to the COVID-19 pandemic.