Prevalence of adjustment disorder in Poland during the COVID-19 pandemic and its association with symptoms of anxiety and depression

Introduction
Due to the current COVID-19 pandemic, many new stressors have arisen, which is associated with an increased risk of mental disorders. The purpose of this article is to assess the prevalence of adjustment disorder and symptoms of anxiety and depression in the Polish population, on the basis of two studies conducted during the pandemic.

Material and methods
Two online survey studies were conducted at different time points: the first in March 2020 on a N = 1742 sample, the second in June 2020, on the sample of N = 567. In both cases, the same self-description questionnaires were used to measure adjustment disorder, depression and generalized anxiety.

Results
In Study I, 75% of participants considered the COVID-19 pandemic to be highly stressful and 43% declared they met the criteria for adjustment disorder. When anxiety and depression were excluded 8.4% of participants met the criteria. On the other hand, in Study II, the criteria for this disorder (without the exclusion of other disorders) were met by 52%. In both studies, significant positive correlations were observed between the symptoms of adjustment disorder and those of anxiety and depression.

Conclusions
The research provides important data on the mental health of Poles during the pandemic. The proportion of people who have potentially met the criteria for adjustment disorder, as well as for depression and anxiety, seems very high. It is advisable to continue monitoring the occurrence of these disorders, depending on developments in the changing context of the pandemic.