1. Introduction
COVID-19 is a virus that spread vastly and suddenly all over the world, and which, due to its high hospital-admissions and mortality rates at the time, was the cause of abrupt lockdowns, which in turn prompted declines in economic activity and mental health. As the world was unprepared for this health emergency, governments mishandled health departments, economic matters, media information, and eliminated personal freedom for the greater good, universally leading people to an unknown, struggling, lonely, stressed, and/or depressed state [
1].
Since the virus’s onset, there have been many millions of confirmed COVID-19 cases, deaths due to COVID-19, and recoveries, which on the one hand show promising recovery rates, but on the other hand, the numbers themselves project the magnitude of the pandemic’s global impact. Several studies suggest that due to this massive outbreak and its consequences, mental health diseases have either started or already existing ones deteriorated [
2,
3,
4]. Initial evidence suggested that anxiety and depression symptomatology and self-reports on stress are the most usual psychological repercussions of the COVID-19 pandemic and could also be associated with sleep disturbances [
4]. Moreover, various literature reviews support that COVID-19 pandemic was significantly associated with low levels of mental health and psychological distress universally, and in some individuals reached clinical levels [
5,
6]. Anxiety, depression, posttraumatic stress disorder (PTSD), psychological stress, and distress are the most common mental health issues that surfaced during and after the lockdowns, mostly due to uncertainty, fear of health and economic instability, loss of a loved one, intense exposure to adversities via media, and many other COVID-19-related topics that affected people [
5,
6]. Longer quarantines due to higher infection statistics resulted in intense fear of infection, grievance, weariness, insufficient supplies and information, financial hardships, and mostly stigma [
2].
Studies concerning several countries assert that in the beginning of the pandemic, citizens from different countries showed high stress levels due to fear of infection, or being at high risk. The isolation itself proved to be a strong stress indicator, and, along with traumatic media exposure, hospitalization, or death of a loved one, and personal symptomatology triggered stress symptoms in extreme levels, which in turn can exacerbate PTSD and depression [
7]. A study concerning the Chinese population explained that as China was the first country that was severely affected by the COVID-19, its data on psychological issues such as anxiety, depression, and sleep disturbances were astonishing [
8]. China was also the country with the strictest lockdowns and extreme levels of freedom deprivation and propaganda, resulting in the highest levels of generalized anxiety disorder (GAD), depressive symptoms, and sleep quality. The same study showed that the percentages for these three mental health issues were 35.1% for GAD, 20.1% for depression, and 18.2% for sleep disturbances in a large sample. Younger adults showcased the highest prevalence of GAD and depressive symptoms compared to older adults, and the sleep-disturbance data were mostly significant for healthcare workers. Finally, the time spent exposed to COVID-19 news proved to be a significant mediator for GAD [
8].
Other countries, such as Austria, presented alarming increased data on anxiety symptoms and depressive symptoms during COVID-19 compared to prior epidemiological data [
3]. A considerable percentage (16%) of the sample that was collected, were also over the cut-off point for moderate/severe insomnia. Further, research indicated that the most affected age group was younger adults (<35 years), which inspired this study’s focus. Again, significant factors were shown to be low income and job loss, especially with regard to women, and another factor that influenced the direction of this study was the physical inactivity which operated interdependently with stress, depression, and insomnia. A study conducted in Italy on the same matter asserted very similar prevalence of depression, anxiety, and insomnia; they also investigated high perceived stress, adjustment disorder, and posttraumatic stress disorder (PTSD), and the incidence reported was 21.8%, 22.9%, and 37%, respectively, showing that the pandemic’s effects on mental health is severe [
9].
Concerning the Greek population, studies showed that they were no exception, and that the pandemic affected them negatively at an almost identical rate compared to other countries. Various studies across the country demonstrated findings which show that Greeks were severely affected during and after the first and the second lockdown, in many mental health areas [
10,
11,
12]. High levels of COVID-19-related fear (35.7%), moderate/severe symptoms of depression (22.8%), and an important percentage of moderate/severe anxiety (77.4%) are only a few of the COVID-19-caused mental health issues [
12]. Additionally, women also reported higher scores than men, while younger adults showed less COVID-19-related fear, low depressive symptomatology, and low rates of social responsibility, compared to other countries. COVID-19-related fear was highly associated with a significant other’s illness, psychiatric medication intake, and inadequate compliance with guidelines. Further on, age, gender, depression, and anxiety were correlated with COVID-19-related fear. A similar study showed that, although women were more traumatized than men by social distancing and quarantine curfews, men exhibited higher levels of post-traumatic (PT) growth, (life appreciation and spirituality) than women [
11]. Stress and post-traumatic stress (PTS) were highly associated with PT growth and enabled its expansion in the context of COVID-19. Finally, the COVID-19 lockdown was associated with high rates of anxiety and depression in senior high-school students [
10].
The impact of physical activity (PA) on mental health was also considered in many Greek-population studies, as it provided significant and illuminating results. Although mandatory home quarantines and isolation measures were correlated with a decrease in physical activity and exercise, these results are obtained from very specific periods of lockdown [
13]. As the authors mentioned, in every quarantine phase the overall PA was decreased, however, combined data showed that, towards the quarantine’s end, PA scores started to gradually increase again.
The prementioned COVID-19-related mental health issues seemed to manifest other physical abnormalities. Global statistics showed an increase in heart problems, various cancers, substance abuse, and even skin abnormalities. Statistics show that an acne-affected adults have higher self-efficacy in controlling stressful circumstances than others who suffer from other skin disorders. Furthermore, they assert that adults who have skin problems associate the symptoms’ worsening with intrapersonal factors, such as fear, stress, and environmental influences [
14]. Finally, longitudinal research suggested that perceived stress and PTSD were at higher levels during quarantine, compared to the end of it. Loneliness and use of nonadaptive coping mechanism also had higher levels, whereas resilience, social support, and use of adaptive coping skills were significantly lower. At the time of both lockdowns, PTSD was predicted by loneliness, perceived stress, coping skills, and reduced resilience. Evaluating the pandemic as a crisis also increased PTSD, it was also correlated with female gender, younger age, being single, and childlessness [
15].
Considering the above, further research upon the matter is crucial in order to examine any limitations of previous research, ongoing issues, and the possible long-term consequences on public mental health caused by COVID-19 lockdowns. This study, by utilizing a sample of Greek citizens, aims to examine the prevalence of stress and depression symptoms, and their association with demographic characteristics, physical activity and overall quality-of-life.
3. Results
Previous findings regarding the prevalence of depression symptoms and perceived stress in the Greek population are presented in
Table 2. In our study, the findings suggest that perceived stress during the second lockdown was elevated compared to previous periods, and participants exhibited at least a moderate level of stress in 48.8% of the total sample, while 14.8% of the participants displayed excessive stress. Most of the participants (80.6%) had at least mild symptoms of depression, indicating that depression symptomatology was more prominent during the second lockdown.
Table 3 presents the descriptive statistics of depression, perceived stress, quality-of-life, and physical activity across males and females. Female participants had elevated perceived stress and depression symptoms compared to male participants, with the difference in depression being significant (
t = 2.24,
p = 0.026). Females also had higher scores in the social relationships (DOM3) and environment (DOM4) dimensions, while males had higher scores in physical health (DOM1) and psychological health (DOM2) dimensions, although the differences did not attain statistical significance.
Table 4 presents the Spearman’s correlation coefficient between the outcome variables. Perceived stress had a significant positive correlation with depression symptoms (
rs = 0.671,
p < 0.01), and negative significant correlation with all the quality-of-life dimensions. Depression showed negative significant correlations with all the quality-of-life dimensions, and also exhibited negative correlation with physical activity (
rs = −0.150,
p < 0.01).
For the perceived stress, the results of the stepwise regression model based on the AIC are presented in
Table 5. The model was overall significant and explained approximately 46.1% of PSS’s variability,
F(8, 321) = 36.23,
p <.001. The variables that were retained in the model were the gender, age, occupation status, university student status, and physical (DOM1) and psychological health (DOM2). More specifically, full-time working participants showed less perceived stress compared to unemployed participants (
b = −1.95,
t = 3.345,
p = 0.001), while age had a negative effect on perceived stress, with older individuals perceiving less stress compared to those younger (
b = −0.08,
t = 3.56,
p < 0.001). Finally, both physical and psychological health exhibited a negative association with perceived stress.
The stepwise regression model regarding the depression symptoms (
Table 6) explained approximately 61.8% of BDI’s variability,
F(5, 324) = 107.4,
p < 0.001. The variables that were retained in the model were the gender, the age, the physical (DOM1), psychological (DOM2), and social relationships (DOM3) dimensions. Females had significantly elevated scores on depression compared to males (
b = 2.831,
t = 2.992,
p = 0.003). Similar to perceived stress, the age of the participants had a negative effect on depression (
b = −0.177,
t = 4.816,
p < 0.001). Finally, both physical and psychological health exhibited a negative significant relationship with depression, while social relationship was also negatively associated with depression, although not attaining statistical significance.
K-means clustering was implemented to group participants based on their perceived stress, depression, quality of life, and physical activity. The highest value of ASW was obtained for two clusters, which confirmed the elbow plot, indicating that the optimal number of clusters was k = 2, where the plateau was observed. The continuous characteristics of participants were compared across the two clusters using the Wilcoxon signed-rank test and are presented as medians and lower and upper quartiles (Q1 and Q3), while for the categorical characteristics, the chi-square test was used (
Table 7). The first cluster consisted mainly of young female participants (71.3%), who were either unemployed (45.9%) or full time employed (34.4%) and had elevated values in depression symptoms and perceived stress. The second cluster included older individuals (
Mdn = 37 years), who were working full-time (46.8%), with higher physical activity, elevated scores in all quality-of-life dimensions and decreased symptoms in depression and stress.
4. Discussion
The aim of the study was to examine the prevalence of the stress and depression symptoms, and their association with demographic characteristics, physical activity, and overall quality-of-life in the Greek population. The main findings indicate that stress and depression were elevated during the second COVID-19 lockdown. Depressive symptoms and stress were negatively associated with the physical and psychological quality-of-life of the individuals. Social relationships, which were restricted during the quarantine, also attained a negative relationship with depression symptoms. Physical activity was also negatively correlated with depression symptoms, yet the impact was not significant while adjusting for the other individual characteristics. Certain demographic characteristics, such as being young, female, and unemployed, were linked to higher scores in depression and perceived stress.
An extensive literature exists that suggest that the quarantine restrictions due to the COVID-19 pandemic had an impact on the psychological health of the individuals [
3,
7,
8,
14,
15]. The additive effect of the lockdown is also apparent, with previous longitudinal studies showing an increasing trend in anxiety and perceived stress during the second lockdown compared to the first [
15]. We have observed greater perceived stress compared to studies in the same country [
10,
11]. In the second lockdown, reduced physical activity has also been observed compared to previous studies, which evaluated the MET in the first lockdown [
13].
In contrast with studies which examined the prevalence of depression and stress before the pandemic, our findings suggest that perceived stress and depression symptoms were elevated during the period of the second lockdown in Greece [
16,
31,
35]. Furthermore, depression symptoms were more apparent to females or unemployed individuals. These findings confirm earlier results in Austria, Italy, Greece, and China, which suggested that female individuals are more affected by depressive symptoms and anxiety than males [
3,
12,
36,
37]. This is not a novel finding, as major pandemics and economic crises have a disproportionately negative impact on vulnerable groups, such as minorities, individuals who lack socioeconomic resources, the elderly, and those with chronic conditions [
38]. People of low socio-economic status have higher risk of exposure to COVID-19, are not privileged to work remotely, experience financial uncertainty, and often do not have access to health services, with all these factors negatively affecting mental health [
38,
39].
In the present study, younger individuals had higher scores on both depression and perceived stress, displaying a negative effect of age. On the contrary, a previous study suggested that younger individuals in Greece had lower depression levels and lower fear-related indicators towards COVID-19 [
12]. In line with our findings, previous results have shown that sedentariness negatively affects well-being, while physical activity is a positive predictor of well-being [
40].
Limitations
As this study had a cross-sectional design, it only captured limited information on the psychological impact in one timeframe and comparison with unrestricted periods was not possible. Also, a causal effect between the lockdown and the increase of stress or depression symptoms cannot be directly inferred. We propose a more thorough investigation of the psychological effect of the lockdown, by directly comparing psychological indices via longitudinal designs. Furthermore, the self-report instruments that were used, in addition with the on-line questionnaire deployed, may introduce sample bias.